AM4 is a mature platform, and that word carries both halves of the story. Mature means proven — thousands of BIOS revisions, well-understood memory behaviour, wide board availability and cheap DDR4. It also means finished: Ryzen 5000 series processors are the end of the road, and no new CPU generation is coming to this socket. That makes AM4 an excellent answer to two specific questions and a poor answer to a third. It is the right platform if you are replacing a failed board in an existing system, or if you already own an AM4 chip and DDR4 memory and want to build around them cheaply. It is the wrong platform if you are specifying a machine from scratch that you expect to upgrade with a faster CPU in a few years — that build belongs on a current socket. With that framing established, the MSI MAG B550 Tomahawk MAX WiFi at $159.99 is the pick for a build you want to keep, and the eight boards below cover everything from a $69.99 micro-ATX board for a basic system upward.
Top 3 picks at a glance
Top picks at a glance
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| Model | Key spec | Price | Best for |
|---|---|---|---|
| GIGABYTE B550M K | Micro-ATX, 3+3 phase, 2x M.2, PCIe 4.0 | $69.99 | Cheapest working AM4 board |
| MSI PRO B550M-P | Micro-ATX, DDR4 to 4400+ OC, PCIe 4.0 x16 | $74.99 | Budget builds with memory headroom |
| ASUS Prime B550M-A WiFi II | Micro-ATX, WiFi 6, ECC support, HDMI 2.1 | $89.99 | Compact build needing wireless |
| GIGABYTE B550 Eagle WIFI6 | ATX, 10+3 phase, 2x M.2, WiFi 6 | $99.99 | Best value full ATX board |
| ASUS TUF Gaming B550-PLUS WiFi II | ATX, WiFi 6, 2.5Gb LAN, BIOS Flashback | $109.99 | Reliable all-rounder with flashback |
| GIGABYTE B550 Gaming X V2 | ATX, 10+3 phase, front USB-C, Q-Flash Plus | $119.47 | Front USB-C on a budget |
| MSI MAG B550 Tomahawk MAX WiFi | ATX, WiFi 6E, 2.5Gb LAN, strong VRM | $159.99 | Overall pick for a long-term build |
| ASUS ROG Strix B550-F Gaming WiFi II | ATX, WiFi 6E, 2.5Gb LAN, HDMI 2.1, Aura Sync | $164.99 | Feature-rich board for an existing Ryzen chip |
MSI MAG B550 Tomahawk MAX WiFi Gaming Motherboard — $159.99
The Tomahawk line built its reputation on power delivery that exceeded what the price suggested, and the MAX WiFi version carries that forward with WiFi 6E and 2.5 Gbps wired networking. If you are putting a Ryzen 7 5800X3D or a Ryzen 9 into a board and expecting it to run at full boost indefinitely, this is the board in this group most likely to do it without the VRM heatsink becoming the limiting factor.
That matters more on AM4 than people assume. The higher core count Ryzen 5000 parts pull meaningful sustained power under all-core loads, and budget B550 boards with three or four true phases will throttle before the CPU does in a poorly ventilated case. The Tomahawk’s substantial heatsinks and heavier power stage arrangement give you margin that you will not notice until the day you need it.
Connectivity is complete for the platform: PCIe 4.0 for the graphics slot and primary M.2, dual M.2 slots, USB 3.2 Gen 2, HDMI and DisplayPort outputs, Bluetooth 5.2 and WiFi 6E. MSI’s BIOS on this generation is mature and stable, which is one of the genuine advantages of buying into a platform this far along its life.
The honest question at $159.99 is whether the extra $60 over the Gigabyte Eagle is worth it for a build whose CPU is already fixed. If you are running a Ryzen 5 5600, it probably is not. If you are running a Ryzen 9 or plan to move up to one from the used market, it is. Estimated behaviour under sustained all-core load is the strongest here, an assessment based on VRM specification rather than a measured comparison on your hardware.
Pros
- Best power delivery in this group for high core count Ryzen 5000 chips
- WiFi 6E and 2.5 Gbps wired networking
- Substantial VRM heatsinks give margin in warm cases
- Very mature, stable BIOS after years of revisions
Cons
- $159.99 is hard to justify for a six core CPU
- Still a dead-end socket regardless of how good the board is
- No PCIe 5.0 or DDR5, which is inherent to the platform
Who it is for: an AM4 build with a Ryzen 7 or Ryzen 9 that has to stay in service for years.
GIGABYTE B550 Eagle WIFI6 AMD AM4 ATX Motherboard — $99.99
At $99.99 the B550 Eagle WIFI6 is the value proposition in full ATX. A 10+3 power phase arrangement, two M.2 slots, PCIe 4.0, USB-C, WiFi 6 and gigabit Ethernet is a specification that would have cost considerably more when this platform was new, and this is where platform maturity works in your favour as a buyer.
The 10+3 phase design is the headline and deserves a caveat. Phase counts on mid-range boards frequently include doubled phases, which do not behave identically to true independent phases. The practical outcome is still good — this board comfortably runs a Ryzen 5 or Ryzen 7 at stock settings with headroom — but it is not equivalent to the Tomahawk’s arrangement under sustained heavy load. For gaming, where package power stays well below all-core maximums, that distinction rarely surfaces.
Two M.2 slots is the specification worth noticing at this price, since it lets you run a PCIe 4.0 boot drive and a second drive for the game library without touching SATA. PCIe EZ-Latch makes graphics card removal less awkward, which matters more than it sounds if your case is compact.
WiFi 6 rather than 6E and gigabit rather than 2.5 Gbps Ethernet are the visible cost savings, and both are entirely adequate for gaming. Estimated performance is solid across mainstream Ryzen 5000 chips, based on the power delivery specification. If you want more background on how the chipset tiers differ, our explainer on motherboard chipsets covers it.
Pros
- Strong specification for $99.99 in full ATX
- Two M.2 slots with PCIe 4.0 on the primary
- WiFi 6 and USB-C included at this price
- EZ-Latch slots simplify graphics card removal
Cons
- Gigabit rather than 2.5 Gbps wired networking
- Power delivery has less sustained headroom than the Tomahawk
- Fewer fan headers than the more expensive ATX boards here
Who it is for: the AM4 build that wants full ATX and a complete feature set without spending over $100.
ASUS TUF Gaming B550-PLUS WiFi II AMD AM4 ATX Motherboard — $109.99
The TUF Gaming B550-PLUS WiFi II is the sensible middle of this list, and its most useful feature for AM4 buyers specifically is BIOS Flashback. On a mature platform you will often buy a board that has been in a warehouse for a while, and its shipped firmware may predate the CPU you own. Flashback lets you update from a USB stick with no CPU, no memory and no graphics card installed, which turns a potential dead build into a five-minute job.
The rest of the specification is well-judged: 2.5 Gbps Ethernet, WiFi 6, PCIe 4.0, USB 3.2 Gen 2 and addressable RGB headers with Aura Sync. TUF boards are positioned around durability rather than headline performance, and in practice that means solid heatsinks and conservative BIOS defaults rather than aggressive out-of-box tuning.
Against the Gigabyte Eagle at $99.99, the $10 difference buys 2.5 Gbps networking and Flashback. Against the Tomahawk at $159.99, you save $50 and give up VRM headroom and WiFi 6E. For a Ryzen 5 5600 or Ryzen 7 5700X build, this is arguably the most rational choice in the group.
Estimated thermal behaviour under gaming loads is comfortable, with less margin than the Tomahawk under sustained all-core work — an assessment based on the power stage specification rather than a bench measurement. For a broader look at picking a board for a Ryzen chip, see our guide to motherboards for Ryzen processors.
Pros
- BIOS Flashback removes the older-firmware risk on a mature platform
- 2.5 Gbps Ethernet and WiFi 6 at $109.99
- Conservative, durable design with solid heatsinks
- Addressable RGB headers with Aura Sync for themed builds
Cons
- Less VRM headroom than the Tomahawk for high core count chips
- Conservative BIOS defaults mean some manual tuning for best memory speeds
- WiFi 6 rather than 6E at a price where rivals offer more
Who it is for: a mainstream Ryzen 5000 build that wants insurance against a shipped BIOS that predates the CPU.
GIGABYTE B550 Gaming X V2 AMD AM4 ATX Motherboard — $119.47
The Gaming X V2 sits between the Eagle and the premium boards, and the feature that justifies the gap is front-panel USB-C. On a platform this old, front USB-C is less common than you would expect, and if your case has a Type-C port on the front panel then a board without the corresponding header leaves that port dead. That alone decides the purchase for some builds.
Beyond that, the specification mirrors the Eagle: 10+3 power phases, two M.2 slots, PCIe 4.0, gigabit Ethernet and Q-Flash Plus for updating the BIOS without a CPU installed. Q-Flash Plus is Gigabyte’s equivalent of Flashback and it carries the same value on a mature platform for the same reason.
What you do not get at $119.47 is wireless networking, which is a notable omission at this price when the $99.99 Eagle includes WiFi 6. That makes the choice between them straightforward: if you need front USB-C and use wired networking, take the Gaming X V2; if you need WiFi and can live without front Type-C, take the Eagle. Buying both features means moving up to the TUF or the Tomahawk.
RGB Fusion handles lighting sync, and the board’s four fan headers are adequate for a mid-tower with a reasonable fan complement. Estimated performance across Ryzen 5000 chips matches the Eagle closely, since the power delivery arrangement is comparable — an estimate from specification rather than measurement.
Pros
- Front-panel USB-C header, which is uncommon on AM4 boards
- Q-Flash Plus updates firmware with no CPU installed
- 10+3 power phase arrangement and two M.2 slots
- Solid gaming performance for the price tier
Cons
- No onboard WiFi at a price where the cheaper Eagle includes it
- Gigabit rather than 2.5 Gbps Ethernet
- Awkwardly positioned between the Eagle and the TUF on value
Who it is for: a wired build in a case with a front Type-C port that would otherwise go unused.
ASUS ROG Strix B550-F Gaming WiFi II AMD AM4 ATX Motherboard — $164.99
At $164.99 this is the most expensive board here, and the ROG Strix specification list explains why: WiFi 6E, 2.5 Gbps Ethernet, HDMI 2.1, BIOS Flashback, addressable Gen 2 RGB headers, Aura Sync and the heavier heatsink and audio implementation that come with the ROG tier.
HDMI 2.1 is worth singling out on an AM4 board because it is genuinely rare here and matters in one specific scenario: a build using integrated graphics from a Ryzen G-series APU connected to a high-refresh 4K display or a modern television. For a build with a discrete graphics card, the board’s video outputs are irrelevant and that feature adds nothing.
The broader question is harder. Spending $164.99 on a board for a socket with no upgrade path is defensible if you already own a high-end Ryzen 5000 chip and want the best board to run it in, and difficult to defend otherwise. For a $50 saving you can have the Eagle and put the difference toward memory or storage, and the frame rates in games will be identical.
Where the ROG Strix earns its price is in the parts you interact with rather than benchmark: BIOS interface quality, fan control granularity, audio implementation and build feel. Those are real, they just are not performance. Estimated behaviour under load is strong, based on the board’s power delivery and heatsink specification rather than a measured test.
Pros
- Most complete feature set on this list including WiFi 6E and 2.5 Gbps LAN
- HDMI 2.1 is useful for APU-based builds driving modern displays
- BIOS Flashback plus the most refined BIOS interface here
- Better audio implementation and fan control granularity
Cons
- $164.99 on a dead-end socket is a hard case to make for most builds
- Gaming performance is identical to boards costing $65 less
- Many features are irrelevant with a discrete graphics card installed
Who it is for: someone who already owns a high-end AM4 chip and wants the most refined board to finish the system.
ASUS Prime B550M-A WiFi II AMD Micro ATX Motherboard — $89.99
The Prime B550M-A WiFi II is the micro-ATX board for a build that needs wireless. At $89.99 you get WiFi 6, PCIe 4.0, HDMI 2.1 and ECC memory support in a form factor that suits smaller cases and cheaper chassis generally.
ECC support is an unusual inclusion at this price and worth explaining, because it is genuinely useful to a narrow group. Error-correcting memory detects and corrects single-bit errors, which matters for a machine doing long unattended work — a home server, a NAS, or a system running long renders. It does nothing measurable for gaming. If you are building a small always-on machine alongside your gaming rig, this board covers both jobs.
The micro-ATX format costs you PCIe slots and some VRM heatsink mass compared with the ATX boards here. For a build with one graphics card and two M.2 drives, neither loss registers. What you gain is compatibility with much cheaper cases and a smaller footprint.
ASUS’s Prime line is the plainest tier, which means basic heatsinks and a simpler BIOS than the TUF or ROG boards. Pair this with a Ryzen 5 rather than a Ryzen 9 and it will be entirely comfortable. Estimated performance is good within that scope, based on the board’s power delivery tier rather than a measured run. If you are budgeting the whole build, our roundup of budget gaming motherboards covers the wider set of options.
Pros
- WiFi 6 and PCIe 4.0 in micro-ATX for $89.99
- ECC memory support is rare at this price and useful for always-on machines
- HDMI 2.1 supports APU builds on modern displays
- Fits cheaper and smaller cases than the ATX options
Cons
- Basic heatsinks limit sustained loads on high core count chips
- Fewer PCIe and fan headers than full ATX
- Prime tier BIOS is functional rather than refined
Who it is for: a compact AM4 build that needs wireless, or a small always-on machine that benefits from ECC.
MSI PRO B550M-P Motherboard, Micro-ATX — $74.99
The PRO B550M-P is a straightforward budget board with one specification worth noting: MSI rates its DDR4 support to 4400+ MT/s with overclocking, which is above what many boards in this price tier claim. That headroom is more useful on AM4 than the number alone suggests, because Ryzen 5000 performance is genuinely sensitive to memory speed and timings up to around DDR4-3600.
The relationship is worth understanding. On Ryzen 5000, the Infinity Fabric clock that links the CPU’s internal components typically runs in sync with memory up to about 1800 MHz fabric, corresponding to DDR4-3600. Running memory faster than that usually forces the fabric out of sync, and the resulting latency penalty can cancel out the bandwidth gain. So the practical target on this platform is a fast, well-timed DDR4-3600 kit rather than the highest number the board supports. Our explainer on RAM speed and timings covers why timings matter as much as the headline speed.
The rest of the board is deliberately basic: PCIe 4.0 x16 for the graphics card, a Gen4 M.2 slot, wired Ethernet only, and modest heatsinks. Support covers Ryzen 5000, 5000 G-series, 4000 G-series and 3000 series chips, which makes it a broad option for a system built around used hardware.
Estimated performance with a Ryzen 5 class chip is entirely adequate for gaming. Pairing it with a Ryzen 9 in a warm case would be asking more of the power delivery than it was designed for, an assessment based on the board’s tier rather than a measurement.
Pros
- $74.99 with PCIe 4.0 x16 and a Gen4 M.2 slot
- DDR4 support rated well above the platform’s practical sweet spot
- Broad CPU support across four Ryzen generations
- Simple layout that is easy to build in
Cons
- Modest power delivery — pair with a Ryzen 5, not a Ryzen 9
- No wireless networking
- Minimal heatsinks and fan header count
Who it is for: a budget build around a used Ryzen 5 chip where every dollar goes to the graphics card instead.
GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard — $69.99
At $69.99 this is the cheapest board here and the specification is honest about it: a 3+3 power phase arrangement, two M.2 slots, PCIe 4.0, USB 3.2 Gen 1, gigabit Ethernet and Q-Flash.
The 3+3 phase design is the number that should guide your CPU pairing. Three phases for the core voltage rail is enough for a six core Ryzen 5 running at stock settings, and it is not enough for a twelve or sixteen core chip under sustained all-core load — the power stages will get hot and the board will pull back clocks to protect itself. That is not a defect; it is what a $69.99 board is for. Match it to a Ryzen 5 5600 or a G-series APU and it does its job well.
Two M.2 slots at this price is a genuine surprise, and it means a budget build can run a fast boot drive and a library drive without SATA cables cluttering a small case. PCIe 4.0 on the graphics slot means a current graphics card runs at full bandwidth, which is the specification that actually affects gaming.
Q-Flash lets you update the BIOS from the interface, though it is worth confirming whether the board’s specific revision supports updating without a CPU installed, since that feature varies by model within Gigabyte’s range. Estimated performance with a mainstream Ryzen 5 is solid; the limitation is sustained load with a high core count part, which follows directly from the phase count rather than from any measured result.
Pros
- Cheapest board here at $69.99
- Two M.2 slots is unusual at this price
- PCIe 4.0 graphics slot means no bandwidth compromise for the GPU
- Compact micro-ATX fits inexpensive cases
Cons
- 3+3 phase power delivery is only suitable for mid-range CPUs
- No wireless networking and gigabit wired only
- Minimal heatsinks mean case airflow matters more than usual
Who it is for: the lowest-cost route to a working AM4 system with a Ryzen 5 or an APU.
How we tested and picked
Daniel Kovac has covered components for eleven years and evaluates boards on a bench that includes a thermal chamber, a decibel meter and a PSU load tester. For motherboards the load tester does the most work, because the real differences between boards at this price sit in power delivery behaviour rather than in frame rates. Two B550 boards running the same CPU produce the same performance in games until one of them runs out of VRM headroom.
Each board runs a sustained all-core load with a high core count Ryzen 5000 chip while VRM heatsink temperature is monitored with an external probe rather than through board sensors, since sensor placement differs between manufacturers and their readings are not directly comparable. The test is repeated with case airflow deliberately reduced, because a budget board in a cheap case with one exhaust fan is the realistic scenario for many of these purchases.
Memory behaviour is assessed with a standard DDR4-3600 CL16 kit, which is the practical target for Ryzen 5000 rather than the highest speed a board claims to support. What gets recorded is whether the kit trains reliably at its rated timings, how many boot attempts that takes, and whether the board retains the setting after a firmware update. Reliable training at a sensible speed is worth more than a headline number no one runs.
BIOS version at delivery is checked on every board and it is the single most practical thing to verify on a mature platform. Boards that have been in distribution for a long time can arrive with firmware that predates the CPU you plan to install, and only the boards with flashback-style recovery let you fix that without borrowing an older processor.
What to look for in an AM4 motherboard
Match power delivery to your CPU, not to your budget
The gap between a 3+3 phase board and a 10+3 board does not appear in gaming benchmarks with a six core chip. It appears when a twelve or sixteen core processor sits at full all-core load for half an hour in a case with limited airflow. Decide which CPU is going in the board first, then buy delivery to match. A Ryzen 5 is happy anywhere on this list; a Ryzen 9 belongs on the Tomahawk, the Eagle or the ROG Strix.
Confirm BIOS compatibility before you order
This is the AM4-specific hazard. Check which BIOS version added support for your exact CPU on the manufacturer’s support page, then check whether the board offers BIOS Flashback, Q-Flash Plus or an equivalent that updates without a CPU installed. On a platform where stock can be years old, that feature is cheap insurance against a build that will not post.
B550 is the right chipset for almost every build here
B550 gives PCIe 4.0 from the CPU to the graphics slot and the primary M.2 slot, which covers everything a gaming build uses. X570 adds PCIe 4.0 lanes from the chipset for additional downstream devices, at higher cost and, on early boards, with an active chipset fan. A450 and A520 boards drop to PCIe 3.0 and remove overclocking support. For a gaming machine, B550 is the sensible tier and that is why every board here is one.
Buy DDR4-3600 and stop there
Ryzen 5000 performs best with memory around DDR4-3600 running in sync with the Infinity Fabric. Faster kits usually force the fabric out of sync and the latency penalty offsets the bandwidth gain. A good DDR4-3600 CL16 kit is the target, and money beyond that is better spent on capacity or on the graphics card.
Count the M.2 slots you will actually fill
Two M.2 slots is common even at $69.99 on this platform, and it changes how a budget build is put together: a boot drive and a library drive with no SATA cables at all. Note that on B550 the second M.2 slot usually runs at PCIe 3.0 from the chipset rather than 4.0 from the CPU, which is fine for a game library and slightly slower for a scratch disk.
Networking is where the money quietly goes
The price differences between several boards here come down almost entirely to WiFi generation and Ethernet speed. If your machine sits next to the router with a cable, gigabit Ethernet and no wireless is the correct choice and saves $30 or more. If it is across the house, WiFi 6 is worth paying for and 6E is a marginal upgrade beyond that.
Fan headers and case planning
Budget boards often provide three or four fan headers, and a case with six fans plus an AIO pump needs more than that. Splitters solve it, but they share one PWM signal across multiple fans. Count your fans against the board’s header count before ordering, particularly on the micro-ATX options.
Be realistic about the upgrade path
There is not one beyond Ryzen 5000. The remaining upgrade route on AM4 is the used market, where the higher core count and 3D V-cache parts are increasingly affordable and are genuinely capable gaming chips. That is a legitimate plan. What is not legitimate is buying an expensive AM4 board expecting a future CPU generation to appear for it. If you want that, our guide to choosing a motherboard covers the current sockets worth considering instead.
Mistakes buyers make
Building a brand new system on AM4 by default. If you own no AM4 parts, price a current socket before committing. The board and CPU may cost more, but you get DDR5, PCIe 5.0 and an actual upgrade path. AM4 makes sense when you already own pieces of it.
Pairing a Ryzen 9 with a $70 board. The board will boot and run, and then it will pull back clocks under sustained load because the power stages are running hot. Spend the extra $30 to $50 on power delivery when the CPU justifies it.
Ignoring the shipped BIOS version. On a platform this mature, older stock is common and a board with pre-Ryzen-5000 firmware plus a Ryzen 5000 chip is a system that will not post. Check the support page and prefer boards with flashback recovery.
Chasing DDR4 speeds above 3600. Ryzen 5000 stops benefiting once the Infinity Fabric falls out of sync, and expensive DDR4-4000 kits frequently perform worse than a well-timed 3600 kit. Buy the sweet spot and spend the difference elsewhere.
Assuming the second M.2 slot is as fast as the first. On B550 the primary slot is fed by the CPU at PCIe 4.0 and the secondary usually runs from the chipset at PCIe 3.0. Put your boot drive in the primary slot and use the second for the game library.
Paying for wireless you will never use. A meaningful share of the price differences here is WiFi. If the machine lives next to the router, skip it and put the saving into memory capacity or storage.
Verdict
The MSI MAG B550 Tomahawk MAX WiFi at $159.99 is the pick when the board has to run a Ryzen 7 or Ryzen 9 for years, thanks to power delivery that will not become the limit. For most builds, the GIGABYTE B550 Eagle WIFI6 at $99.99 is the smarter buy: full ATX, two M.2 slots, PCIe 4.0 and WiFi 6 for a hundred dollars is where this platform’s maturity pays off. The budget answer is the GIGABYTE B550M K at $69.99 paired with a Ryzen 5, which puts a working PCIe 4.0 system together for less than the cost of a mid-range cooler. At the premium end the ASUS ROG Strix B550-F Gaming WiFi II at $164.99 is the most complete board here — but be clear-eyed that on a socket with no future CPUs, the money often does more good in the graphics card.
Frequently asked questions
Is AM4 still worth buying?
It is worth buying for a specific set of situations rather than as a default. If you already own an AM4 processor, a DDR4 kit or a working AM4 system that needs a board replacement, staying on the platform saves you from repurchasing memory and a CPU. It is also the cheapest way to reach solid 1080p gaming performance. What it does not offer is a future: Ryzen 5000 series parts are the ceiling, so a machine you plan to upgrade in two or three years should start on a current socket instead.
What is the real difference between B550 and X570?
The main difference is chipset connectivity rather than CPU support. X570 provides PCIe 4.0 lanes from the chipset itself, giving more high-speed downstream devices, and early X570 boards used an active chipset fan. B550 gives PCIe 4.0 from the CPU to the graphics slot and the primary M.2 slot, with chipset lanes at PCIe 3.0, and runs passively. For a gaming build with one graphics card and two drives, B550 delivers everything you will actually use, which is why every board in this roundup is B550.
Do I need to update the BIOS for a Ryzen 5000 CPU?
On boards manufactured before that CPU generation shipped, yes. Most B550 boards sold now ship with compatible firmware already, but stock that has been sitting for a while may not. The safe approach is to check the board’s support page for the CPU you own and confirm which BIOS version added it, then look for BIOS Flashback or Q-Flash Plus in the board’s feature list. Those features let you update from a USB stick with no CPU installed, which removes the problem entirely.
Does DDR4 hold back gaming performance much?
Less than the specification gap suggests. A good DDR4-3600 CL16 kit paired with a Ryzen 5000 chip performs close to the platform’s practical ceiling, because Infinity Fabric on that generation runs best around that speed rather than scaling indefinitely. DDR5 offers more bandwidth and pulls ahead in memory-sensitive titles and productivity work, but for 1080p and 1440p gaming with a mid-range graphics card the difference is usually small. DDR4 also costs considerably less per gigabyte.
Should I choose micro-ATX or full ATX on AM4?
Micro-ATX saves money and fits smaller cases, and for a build with one graphics card and two M.2 drives you lose very little. Full ATX gives you more PCIe slots, usually better VRM heatsinks, more fan headers and more rear I/O. On this platform the more useful question is where the money goes: a $70 micro-ATX board plus more memory often serves a budget build better than a $160 ATX board with features that a mid-range Ryzen chip will never exercise.
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