The PSU controls the system’s power supply for optimal performance and protection, making it the heart of any gaming PC build. PLUS Gold certified, with 90% (115VAC) / 92% (220VAC~240VAC) efficiency or higher under typical loads It comes in a compact 140mm design to fit all ATX systems and features Seasonic patented hybrid fan control for optimal balance between silence and cooling. Pros:

SFX Power Supplies - SFF Small Form Factor SFX Compact PSU

Seasonic is a reputable PSU manufacturer, and the Focus GX-850 doesn’t fall short! It has an 80+ Gold efficiency rating and is fully modular! The Corsair RM850x power supply is highly regarded by most builders. It’s fully modular and has an 80+ Gold efficiency rating. To be 80 Plus certified means that the PSU has at least 80% efficiency at three load levels of 20, 50, and 100 percent loading. Update: Corsair will be launching an SF850 as Great Wall just launched their Titan TF850, available on TaoBao now. https://www.chiphell.com/thread-2255231-1-1.html

Compatibility of the EVGA SuperNOVA 850 GM, 80 PLUS Gold 850W, Fully Modular, ECO Mode with FDB Fan, 10 Year Warranty, Includes Power ON Self Tester, SFX Form Factor, Power Supply 123-GM-0850-X1 (123-GM-0850-X1)

Once you have decided on the form factor and modular design, the next thing you need to consider is the efficiency rating you can afford. Heavy-duty protections, including OVP (Over Voltage Protection), UVP (Under Voltage Protection), OCP (Over Current Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection) Toughpower SFX series comes with a 16pin connector to offer powerful and stable performance allowing the PSU to natively run next-generation GPUs. Cooler Master V850 SFX for my 2080Ti SLI rig ( https://www.reddit.com/r/sffpc/comments/f14jge/hardest_build_yet_178l_3950x_2080ti_sli_custom/)

850W PSUs For Gaming In 2023 [All Budgets] 10 Best 850W PSUs For Gaming In 2023 [All Budgets]

The Corsair RM850e is a close cousin of the RM850x, and while the latter is quieter, the RM850e is great for clean and tidy cable management due to its flat cables. This PSU is easily the best looking SFX PSU that we have ever tested, and its specifications leave nothing to be desired. You can create an incredibly powerful small form factor system with the ROG Loki 850W, and with its Cybenetics Lambda A certification, you can be sure that your PSU will be one of the quietest components in your system. Since the new era GPUs require more power— especially the RTX 4000 series, an ATX 3.0 PSU ensures your build is future-proofed for power-hungry GPUs. ColorPlease follow the recommended power requirements from the GPU manufactures before using the 12VHPWR cable. Almost all PSU manufacturers design PSUs with the 80 Plus efficiency rating certification. The “80 Plus” rating system is the industry standard!

SFX-L 850W Platinum | Power Supply Units | ROG Global ROG Loki SFX-L 850W Platinum | Power Supply Units | ROG Global

After deciding on the PSU wattage, the next thing you need to consider is the form factor. They’ll either come in the ATX or SFX form factor. ATX 3.0 is the new specification standard for PSUs. This new design adds a new PCIe 5.0 connector with 12 + 4 pins alongside the usual 6 or 8-pin connection.ASUS ROG Thor 1000W Platinum II and ROG Loki 850W Platinum not only look great, they work great. That would be enough to convince you to buy them, were it not for the very, very high price compared to the competition. On their side, though, there's a neat aesthetic and lots of customizable RGB LEDs. If you want lots of power in your gaming PC without sacrificing aggressive design, these are two badass power supplies ready for any challenge! A fully modular power supply unit lets you use only the cable you need for simple and clean cable management.

850W Cooler Master V850 SFX : r/sffpc - Reddit 850W Cooler Master V850 SFX : r/sffpc - Reddit

Simply put, an 850W 80 Plus PSU will draw a maximum of 1,062.5W at 100% load, which means less wattage is wasted as heat in the conversion process, saving your energy bill.Most gaming builds will need power ranging between 450 to 650 watts unless you use a powerful GPU like the recently released RTX 4090. I presume you already have the estimated total wattage that your PC will draw, and an 850W PSU is the ideal power supply unit to complete the build. We love this little LOKI, it's a blast. Small, ultra powerful and ultra quiet, these are its qualities, but not only. It also has a touch of RGB and some great cables.