EVGA SuperNOVA 850 P5 Power Supply: 850W Platinum, fully modular

The EVGA SuperNOVA 850 P5 (model 220-P5-0850-X1) is an 850W power supply for desktop PCs. It is 80 PLUS Platinum certified, fully modular and compact, and EVGA aims it at builders who want quiet operation and tidy cabling. Here is what those terms mean and what to check for your build.

What 850W means for a build

The wattage is the total power the supply can deliver. A PC only draws what its parts need, so a higher wattage doesn't mean higher use. It means headroom: a system with a powerful graphics card and a fast processor can have peaks well above its average draw, and a supply with margin handles those more comfortably. To choose a wattage, add up the recommended power of your graphics card and processor, allow for drives and fans, and leave some margin.

What 80 PLUS Platinum means

80 PLUS is an independent certification of efficiency, which is how much of the power drawn from the wall reaches your components instead of being lost as heat. Platinum is one of the higher tiers. EVGA states 92% efficiency or higher under typical loads. In general, a more efficient supply wastes less energy as heat, which can let the fan work less.

Fully modular cables

"Fully modular" means every cable, including the main motherboard cable, detaches from the supply. You connect only what your build needs. Fewer cables typically means less clutter and better airflow in the case, and it makes routing easier in a small build. The listing doesn't give the connector count here, so check the product manual for the exact cables included.

Internal design and the fan

EVGA says the supply uses 100% Japanese capacitors and an active clamp with a +DC-DC converter design to improve stability on the 3.3V and 5V rails, and that it has active power factor correction. It also has a fluid dynamic bearing fan, which is a sealed bearing type generally chosen for low noise and long life. The brand's ECO mode controls the fan so it can stay stopped or slow at lighter loads, for quieter operation. The description mentions a 135mm fan, while the title states a compact 150mm body size.

Power-on standards and tester

The brand says the line supports the latest Intel power-on standards and includes a power-on self tester, a small device that helps confirm the supply starts before you connect it to a motherboard.

Size and warranty

It measures about 5.9 x 5.9 x 3.4 inches (15 x 15 x 8.6 cm) and weighs 0.7 lb (about 0.32 kg), which, as stated in the listing, makes it a compact unit. EVGA gives a 10-year limited warranty.

Who it suits

It suits desktop builders who want a modular supply with plenty of headroom for a high-end graphics card and a quiet fan profile, including those in smaller cases where cable clutter is a concern.

What to check before you buy

• Wattage: add up your parts' needs, with a margin.
• Connectors: confirm your graphics card's power connector type, and whether the supply provides the cables and connectors it needs.
• Case fit: confirm your case takes a compact ATX-style supply of this size.
• Cables: use the cables supplied with the unit, as modular cables generally aren't interchangeable between brands or models.
• Upkeep: follow the manual for installation and warranty terms.

The short version

• 850W, 80 PLUS Platinum power supply with stated efficiency of 92% or higher under typical loads.
• Fully modular, with a compact 150mm body.
• Fluid dynamic bearing fan with ECO mode; Japanese capacitors and active power factor correction.
• Includes a power-on self tester; 10-year limited warranty.

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