Do You Need a Bigger Power Supply Than You Think?

Power supplies are one of the least exciting parts to shop for, which is probably why they’re also one of the most commonly underspecced. A few things worth knowing before you buy one.

Wattage isn’t the only number that matters

Two 650-watt power supplies can behave very differently under load depending on their efficiency rating and how the load is distributed across their rails. An 80 Plus Gold or better rating is a reasonable baseline for anything running a dedicated graphics card for long sessions.

Transient spikes catch people out

Modern graphics cards can briefly draw far more power than their rated figure during short spikes. A PSU sized exactly to the “recommended” wattage on a spec sheet can trip or shut down under these spikes even though average draw is well within its limits — this is the main reason we usually recommend one tier above the bare minimum.

Modular cabling is worth the small premium

Fully modular power supplies let you leave out cables you’re not using, which noticeably improves airflow and cable management in smaller cases. Not essential, but a easy quality-of-life upgrade if your budget allows it.

When in doubt, size up rather than down

A power supply running well under its maximum load runs cooler, quieter and more efficiently than one running near its limit. If you’re between two wattages, the higher one is almost always the better long-term choice, especially if you plan to upgrade the graphics card later.