We use cookies for analytics to understand how the site is used and to improve it. Essential cookies are always on. You can accept or reject analytics cookies — see our Cookie Policy and Privacy Policy.
Best Power Supply Prices
ATX power supply units (PSUs) by wattage and efficiency. 14 products.
Last updated today
Daily from Amazon
Power Supply Buying Guide
Editor's Note
A power supply failure can take other components with it. The one component where you should not chase the cheapest price is the PSU. 80+ Gold efficiency is the minimum I'd recommend — it's more efficient under load, runs cooler, and the manufacturers that meet Gold certification generally have better component quality inside the unit. For a 650W Gold PSU, the Corsair RM650x and Seasonic Focus GX-650 are both reliable platforms with 10-year warranties. Size your PSU at 1.3–1.5× your system's peak load for headroom and to keep the fan quieter (PSU fans spin up under high load).
Fully modular, 80+ Gold, and zero RPM fan mode below 40% load means near-silent operation during gaming. The 10-year warranty reflects Corsair's confidence in the internals — OEM'd from a high-quality platform. At 650W it covers RTX 4070 builds with CPU headroom, and modular cables simplify cable management significantly.
⚠Buying a no-name 650W PSU to save $30 — a low-quality PSU can deliver unstable voltage that causes random crashes, or fail catastrophically and damage connected components; the PSU is not where to cut costs
⚠Undersizing for future upgrades — an RTX 4070 build needs 650W today; adding a second M.2 drive, more RAM, or upgrading to a 4080 later pushes that to 750W+; buying an 850W unit now costs $20–30 more and eliminates a future upgrade bottleneck
⚠Ignoring efficiency at your load level — 80+ Gold is rated at 50% load; at 10–20% load (idle PC), even a Gold PSU drops to 85% efficiency; Platinum or Titanium units are worth the premium only for always-on workstations or servers
For a mid-range build (RTX 4060/4070 + Ryzen 5/Core i5): 650–750W. For high-end (RTX 4080/4090 + Core i9/Ryzen 9): 850–1000W. Always leave 20–30% headroom above your system's peak draw for efficiency and future upgrades. Use a PSU calculator with your exact components to confirm.
What does 80 Plus Gold mean?
80 Plus is an efficiency certification — it measures how much wall power actually reaches your components vs lost as heat. Bronze (~85%), Gold (~90%), Platinum (~92%), Titanium (~94%). Gold is the value sweet spot in 2026: meaningfully efficient, cooler, quieter, without the price premium of Platinum/Titanium.
Is a modular power supply worth it?
Fully modular PSUs let you connect only the cables you need, improving airflow and making cable management much cleaner. Semi-modular keeps essential cables attached and detaches the rest. For most builders, fully or semi-modular is worth the small premium for a tidier, better-cooled build.
Do I need a 750W or 1000W PSU for an RTX 4080 build?
An RTX 4080 has a 320W TDP. Paired with a Core i7 or Ryzen 7 (~125W), your system draws ~500–550W under full gaming load. A 750W Gold PSU gives solid headroom and headroom for CPU boost spikes. 850W is the recommended choice for future-proofing and efficiency. A 1000W PSU is only necessary if you're pairing an RTX 4090 (450W TDP) with a high-end CPU.
How long does a power supply last?
Quality PSUs from Seasonic, Corsair, and EVGA are typically rated for 100,000 hours MTBF and carry 5–10 year warranties. In practice, a Gold or Platinum PSU from a reputable brand lasts 7–10 years in a normal build. Cheap PSUs fail sooner and can damage connected components when they do. The PSU is the one component where saving $20 by buying a lower-quality unit is not worth the risk.
What is ATX 3.0 and do I need it?
ATX 3.0 is the updated power supply spec that includes a native 16-pin PCIe 5.0 connector (600W capable) for high-TDP GPUs like the RTX 4080 and 4090. If you have an RTX 4090, an ATX 3.0 PSU with a 16-pin connector eliminates the adapter required by older units. For any GPU below the 4090, a quality ATX 2.52 PSU with adequate wattage is sufficient — the 16-pin adapter that ships with most current GPUs works without issue.
