Best Power Supplies Under £400 (2026)
60 active power supplies priced at or below £400 · sorted by editor rating then price · prices update hourly
About this price band
The £400 cap is where most UK buyers in the power supplies market actually shop. We only feature products with a live, primary affiliate offer, so every entry can actually be bought today. Prices are pulled from Amazon UK and refreshed on a regular schedule, so what you see here is what you will pay on the merchant page when you click through.
Every power supply we list under £400
Gigabyte AORUS ELITE P850W 80 Plus Platinum Fully Modular PCIe 5.1 ICE Power Supply Unit, ATX 3.1, 12V-2x6 GPU Connector, Flat Cables, 10 Year Warranty
5.0/5£123.99
CORSAIR CX550 80 PLUS Bronze Non Modular Low-Noise ATX 550 Watt Power Supply - UK - Black
4.6/5£45.59
GIGABYTE P650G PCIE 5.1 Power Supply - PCIe 5.1, 80 Plus Silver, 120mm Fan, ATX 3.1 Compliant, EU Plug
4.5/5£51.87
MSI MAG 850W Power Supply 80 Plus Gold - ATX 3.0 PCIe 5.0 Ready - 12VHPWR [MAG A850GL PCIE5]
4.5/5£77.59
ASUS ROG Loki SFX L 850W Platinum White Edition (Fully Modular Power Supply, 80+ Platinum, 120mm PWM ARGB Fan, Aura Sync, ATX 3.0 Compatible, PCIe 5.0 Ready)
4.4/5£188.99
Gigabyte UD750GM PG5 V2 80 Plus Gold Fully Modular 750w PCIe 5.0 Power Supply Unit, ATX 3.1, 12VHPWR GPU Connector, Flat Cables, 10 Year Warranty
3.3/5£79.99
