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Best Power Supply Prices

ATX power supply units (PSUs) by wattage and efficiency. Updated daily from Amazon.

Price:

3 Power Supply drives

Sort:
#ProductCapacityReadWriteTBWWarrantyScore$/TBPriceBuy
1
Corsair RM850 850W 80+ Gold Fully Modular ATX PSUBest value
Corsair
————10 years55.3

Frequently Asked Questions

What wattage power supply do I need?

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.

$119,990.00/TB
$119.99
$119.99
2
Corsair RM850e 850W 80+ Gold ATX 3.1 Fully Modular PSU
Corsair
————7 years37.7$129,990.00/TB$129.99$129.99
3
Corsair RM850x 850W 80+ Gold Fully Modular ATX PSU
Corsair
————10 years20.3$139,990.00/TB$139.99$139.99
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.