ASUS Prime AP-850G 850W Gold Power Supply: features, specs and fit

The ASUS Prime AP-850G is an 850-watt ATX power supply for desktop PCs. Its job is to convert wall power into the steady low-voltage supplies the processor, graphics card and drives need. It is aimed at gaming and other high-performance builds, and it follows the ATX 3.0 guidelines for newer graphics cards.

What 850 watts means

The wattage is the maximum load the unit is built to deliver. It is not the amount your PC draws all the time. Most systems use well below the maximum in everyday work, and a supply typically runs most efficiently somewhere in the middle of its range. To choose a size, add up the power draw of your processor and graphics card and leave headroom. Graphics card makers publish recommended supply sizes.

80 Plus Gold efficiency

80 Plus is a certification that measures efficiency, meaning how much of the power drawn from the wall reaches your components rather than being lost as heat. Gold is one of the higher tiers. ASUS says the certification is the result of low-ESR capacitors and other premium components. Higher efficiency typically means less waste heat and less fan noise for a given load.

ATX 3.0 and the 16-pin cable

ASUS says the unit complies with ATX 3.0 guidelines. The listing highlights a bundled 16-pin PCIe cable compatible with PCIe Gen 5.0 graphics cards. This is the connector found on some newer high-power graphics cards. Not every graphics card uses it, so check what yours needs. If you use the 16-pin cable, seat it fully and avoid sharp bends right at the connector, as the card and supply manuals advise.

Fully modular cabling

Fully modular means every cable detaches from the unit. You connect only the cables you need, which reduces clutter and can improve airflow in the case. The tradeoff is a little more work at install time. Modular cables are generally not interchangeable between brands or models, so use the ones supplied.

Fan and bearings

ASUS describes an Axial-tech fan with a smaller hub, which allows longer blades, and a barrier ring that increases downward air pressure. It uses dual ball bearings, which ASUS says can last up to twice as long as sleeve bearings. The listing also mentions two colour options in one. The supply measures 5.9 x 5.9 x 3.3 inches, weighs about 3.3 lb, and carries an 8-year warranty.

Who it suits

It suits builders of gaming or workstation PCs with a high-power graphics card who want modular cables and a connector for current PCIe 5.0 cards. Smaller systems with modest parts may not need this much capacity.

What to check before you buy

• Total load: add up your parts and compare with 850W, with headroom.
• Graphics card connectors: confirm whether it needs the 16-pin cable or standard 8-pin connectors.
• Case fit: check your case supports a standard ATX supply and has cable room behind the tray.
• Connector count: check the number of SATA, drive and CPU connectors against your build.
• Installation: switch off and unplug the system before working inside it, and follow the manual and local electrical guidance.

The short version

• An 850W fully modular ATX 3.0 power supply from ASUS, model AP-850G.
• 80 Plus Gold certified, with dual ball fan bearings and an Axial-tech fan.
• Bundled 16-pin PCIe cable for PCIe Gen 5.0 graphics cards.
• Standard ATX size, 5.9 x 5.9 x 3.3 inches.
• 8-year warranty.

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