A compact gaming PC belongs in places where a full tower feels excessive: a living-room media console, a small apartment desk, a bedroom setup, or a carefully planned shelf beside a monitor. The challenge is that an RTX 5070 build can still demand a serious power supply, even when the case has room for only an SFX unit. Cable routing, connector access, fan noise, and enough headroom for the rest of the system all matter more in a tightly packed Mini-ITX build.
This roundup focuses on SFX and ITX-format options that make sense for builders pairing a modern graphics card with a space-conscious case. The best sfx power supplies for rtx 5070 shoppers are not automatically the highest-wattage models: the right choice depends on the CPU, storage, cooling, case clearance, desired acoustic profile, and budget. For 2026 buyers, the strongest starting points here are 750W and 850W models from established SFX-focused lines, while 1,000W is best reserved for unusually demanding builds or buyers who want substantial expansion room.
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Our Top Picks
LIAN LI SP850 V2 850W SFX Power Supply850W(V2),Black4.92 x 2.5 x 3.94 inches4.07 PoundsCheck on Amazon
LIAN LI SP1000P 1000W SFX Power Supply4.92 x 2.5 x 3.94 inches4.92 x 2.5 x 3.94 inches4.92 poundsCheck on Amazon
Top 3 picks at a glance
Quick Picks
| Product | Best for | Price |
|---|---|---|
| CORSAIR SF750 Fully Modular Low Noise ATX Power Supply | Most balanced RTX 5070 Mini-ITX build | Check on Amazon |
| LIAN LI SP850 V2 850W SFX Power Supply | 850W Gold-value shoppers | Check on Amazon |
| CORSAIR SF850 Fully Modular Low Noise ATX Power Supply | Premium 850W headroom | Check on Amazon |
| WISLOK Full Module SFX 850W PSU | Budget 850W builds needing a 16P interface | Check on Amazon |
| Cooler Master V750 SFX Gold ITX SFF Power Supply | PCIe 5.1-ready 750W alternative | Check on Amazon |
| Apevia ITX-PFC500W Fully Modular ITX 500W Power Supply | Lower-power ITX systems | Check on Amazon |
| Redragon PSU015 750W SFX Fully Modular Power Supply | Affordable white SFF builds | Check on Amazon |
| LIAN LI SP1000P 1000W SFX Power Supply | Maximum SFX power headroom | Check on Amazon |
How We Compared
We ranked these units around the practical needs of an RTX 5070 small-form-factor build: stated wattage, SFX or ITX suitability, modular cabling, efficiency certification where specified, graphics-card connector readiness, and price. A 750W unit is a sensible baseline category for many carefully selected gaming systems, while 850W provides more room for a higher-draw processor, additional drives, and future component changes. The 1,000W LIAN LI is included for builders who prioritize overhead in the smallest possible enclosure.
We also gave extra weight to details that affect the assembly experience. Fully modular designs let builders install only the cables they need, which can be especially useful in a cramped case. PCIe 5.1 readiness and a stated 16P latest graphics-card interface are relevant features for shoppers who want a more direct graphics-power connection. We did not assign performance claims, noise measurements, physical dimensions, or cable lengths that were not provided by the product listings.
The 8 Best Picks
1. CORSAIR SF750 Fully Modular Low Noise ATX Power Supply
The CORSAIR SF750 is the best all-around pick for an RTX 5070-focused Mini-ITX build when 750W fits your complete component plan. Its fully modular setup is a meaningful advantage in small cases, where unused cables quickly become an airflow and cable-management problem. The low-noise positioning also makes it appealing for a desk-side PC or living-room system where fan sound can be distracting.
- Pro: 750W capacity is a strong starting point for many compact gaming builds.
- Pro: Fully modular cabling helps keep a small enclosure organized.
Skip it if your planned CPU and expansion hardware make 850W or 1,000W the more comfortable target.
2. LIAN LI SP850 V2 850W SFX Power Supply
Its 80 Plus Gold certification makes it a straightforward fit for buyers who want an efficiency-rated SFX supply from a recognized SFF-oriented category. This is the model to consider when your RTX 5070 system includes a more ambitious processor or you simply prefer extra room in the power budget.
- Pro: 850W provides more headroom than the 750W entries.
- Con: It is Gold-rated rather than Platinum-rated.
Skip it if a stated PCIe 5.1-ready feature is a must-have for your build plan.
3. CORSAIR SF850 Fully Modular Low Noise ATX Power Supply
The CORSAIR SF850 is for the buyer who wants premium 850W capacity, fully modular cables, and a low-noise focus in one compact-power category. It makes the most sense in an RTX 5070 build where the rest of the system is not being chosen strictly to minimum power needs: think a performance-oriented CPU, multiple storage devices, or a build you expect to refresh over time.
- Pro: 850W offers useful planning flexibility for a compact gaming PC.
- Pro: Fully modular, low-noise positioning suits tidy SFF builds.
4. WISLOK Full Module SFX 850W PSU
The WISLOK Full Module SFX 850W PSU targets cost-conscious builders seeking 850W capacity and a stated 16P latest graphics-card interface. The listing also specifies a hydraulic-bearing fan, full modularity, and SFX suitability for Mini-ITX and SFF PCs. Its stated compatibility references RTX 3060, RTX 4060, and RTX 4090 graphics cards, but buyers should still verify their exact GPU connector and system requirements before purchasing.
- Pro: Includes a stated 16P latest graphics-card interface.
- Con: No efficiency certification is specified in the supplied listing.
Skip it if you prefer a model with a listed Gold or Platinum efficiency rating.
5. Cooler Master V750 SFX Gold ITX SFF Power Supply
The Cooler Master V750 SFX Gold is a strong middle-ground choice for builders who want 750W, an 80 Plus Gold rating, and stated PCIe 5.1 readiness without spending premium-CORSAIR money. The ITX SFF positioning is directly relevant for compact-case shoppers, and PCIe 5.1 readiness can simplify planning for a current-generation graphics-power setup.
- Pro: PCIe 5.1-ready status is useful for modern GPU-focused builds.
- Con: 750W leaves less reserve than the 850W selections.
Skip it if you want extra wattage headroom for a more power-intensive overall configuration.
6. Apevia ITX-PFC500W Fully Modular ITX 500W Power Supply
It includes active PFC and supports 90–264V input, making it more appropriate for modest ITX systems than for an RTX 5070 roundup winner. Its presence here is useful because it illustrates why wattage should not be treated as an afterthought simply because a power supply physically fits the case. For an RTX 5070 build, buyers should carefully compare the graphics-card maker’s stated system power guidance with their complete component list.
- Pro: Fully modular design is welcome at this budget level.
- Con: 500W is substantially below the 750W-to-1,000W options here.
Skip it for most RTX 5070 systems; consider it only for a lower-power ITX build with verified requirements.
7. Redragon PSU015 750W SFX Fully Modular Power Supply
The white Redragon PSU015 is the standout for builders who want an affordable light-colored SFF power supply without giving up 750W capacity. The included ATX-compatible panel adds flexibility for shoppers whose case or mounting arrangement benefits from it. This is a particularly appealing option for a white-themed compact gaming system where cable management and appearance both matter.
- Pro: Smart-ECO 0 RPM fan feature supports quiet-light-load use.
- Con: White styling may not suit every blacked-out build.
Skip it if you need 850W or prefer a PSU specifically marketed as PCIe 5.1-ready.
8. LIAN LI SP1000P 1000W SFX Power Supply
The LIAN LI SP1000P is the high-headroom choice for builders who refuse to compromise on wattage simply because they are building small. It delivers 1,000W in an SFX power-supply format and carries an 80 Plus Platinum rating. That does not mean every RTX 5070 system needs it, but it is the clearest option for ambitious CPUs, extensive accessories, or long-term flexibility.
- Pro: 1,000W is the largest stated capacity in this roundup.
- Con: Most carefully configured RTX 5070 builds may not require this much capacity.
Skip it if you are building to a fixed budget and a 750W or 850W unit meets verified system needs.
Buying Guide
Choose Wattage for the Whole PC, Not Just the Graphics Card
Start with the exact power recommendation for your chosen RTX 5070 model, then account for the CPU, motherboard, memory, storage, fans, pumps, USB-powered accessories, and expected upgrades. In this list, 750W is the entry point for many gaming-focused SFF builds, 850W adds more planning margin, and 1,000W is for buyers who want maximum overhead. A 500W unit is a separate, lower-power category and should be selected only after confirming it meets the complete system requirement.
Prioritize Modular Cables in a Small Case
Every unnecessary cable creates clutter in a compact enclosure. Fully modular units allow you to use only the required leads, helping with installation and airflow planning. Before buying, confirm your case’s PSU format requirement and check the connector needs of your graphics card, motherboard, CPU power input, storage devices, and any accessories. The Cooler Master is listed as PCIe 5.1 ready, while the WISLOK lists a 16P latest graphics-card interface.
Balance Efficiency, Noise Features, and Price
Gold and Platinum ratings are useful comparison points, but they should not override fit, connector support, and adequate wattage. The Redragon and LIAN LI SP1000P are listed as Platinum; the LIAN LI SP850 V2 and Cooler Master V750 are listed as Gold. For quiet-focused shoppers, the CORSAIR units are positioned as low noise, while the Redragon lists a Smart-ECO 0 RPM fan. Decide whether those features justify the price difference in your particular case.
Our Verdict
The CORSAIR SF750 is the best balanced pick for an RTX 5070 compact build with verified 750W needs, thanks to its fully modular, low-noise focus. Budget shoppers should look closely at the Redragon PSU015, but should still confirm all connectors and total system power requirements before ordering.
FAQ
Is 750W enough for an RTX 5070 SFF PC?
It can be, depending on the exact graphics card, CPU, and complete system configuration. Confirm the GPU maker’s recommended system power requirement, then include every installed component. The 750W models here are best for builds with verified 750W suitability.
Should I buy an 850W supply instead?
Choose 850W when you want more room for a higher-draw processor, additional storage, more cooling hardware, or future upgrades.
Do I need a PCIe 5.1-ready power supply?
Not necessarily, but it can be helpful when planning a modern graphics-card power connection. The Cooler Master V750 is listed as PCIe 5.1 ready, and the WISLOK listing specifies a 16P latest graphics-card interface. Always verify the connector requirements of your exact card.
Is a 1,000W SFX power supply overkill?
For many RTX 5070 builds, yes. However, the LIAN LI SP1000P can be worthwhile when you want substantial power headroom in an SFX format, are using a demanding CPU, or prefer to avoid replacing the PSU during future upgrades.
