Best Power Supplies Under £300 (2026)
60 active power supplies priced at or below £300 · sorted by editor rating then price · prices update hourly
About this price band
The £300 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 £300
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
NZXT C850 Gold ATX 3.1 (2024) - Low Noise Fully Modular PC Gaming Power Supply - 850W - 80 Plus Gold - 12V Connector - Zero Fan Mode - 100% Japanese Capacitors - Black -
5.0/5£126.99
MSI MAG A550BN Power Supply, EU Plug - 550 W, 80 Plus Bronze Certified, ATX Power Supply, 12 V Single Rail, DC/DC Voltage Converter Design, 120 mm Fan
4.8/5£44.97
ASUS ROG Strix 750 Fully Modular 80 Plus Gold 750W ATX Power Supply with 0dB Axial Tech Fan and 10 Year Warranty
4.8/5£152.05
MSI MPG A1000G Bloc d'alimentation PCI-E5 ATX 1000 W avec Gestion des câbles entièrement modulaire 80 Plus Doré, Noir
4.7/5£103.07
Corsair HX Series, HX1000, 1000 Watt, Fully Modular Power Supply, 80+ Platinum Certified, CP-9020139-NA
4.7/5£149.99
CORSAIR CX550 80 PLUS Bronze Non Modular Low-Noise ATX 550 Watt Power Supply - UK - Black
4.6/5£39.98
GIGABYTE P650G PCIE 5.1 Power Supply - PCIe 5.1, 80 Plus Silver, 120mm Fan, ATX 3.1 Compliant, EU Plug
4.5/5£53
Cooler Master MWE 850 Gold V2 Fully Modular PSU (UK Plug) - 80 PLUS Gold 850W Power Supply Unit, Flat Black Cabling, 120mm HDB Fan, High-Temperature Threshold
4.5/5£67.4
![MSI MAG 850W Power Supply 80 Plus Gold - ATX 3.0 PCIe 5.0 Ready - 12VHPWR [MAG A850GL PCIE5]](https://www.vividrepairs.co.uk/wp-content/uploads/2025/12/MSI-MAG-850W-Power-Supply-80-Plus-Gold-ATX-3.0-PCIe-5.0-Ready-12VHPWR-MAG-A850GL-PCIE5.jpg)
MSI MAG 850W Power Supply 80 Plus Gold - ATX 3.0 PCIe 5.0 Ready - 12VHPWR [MAG A850GL PCIE5]
4.5/5£78.53
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
CORSAIR RM750x SHIFT (2025) Fully Modular ATX Power Supply – Modular Side Interface, Native 12V-2x6 Cable, ATX 3.1 & PCIe 5.1, Fan-Speed Control, 105°C-Rated Capacitors, Cybenetics Gold – Black
3.0/5£111.95
