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£117.99
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
TUF Gaming 850W Gold (850 Watt, ATX 3.0 Compatible, Fully Modular Power Supply, 80+ Gold, Military-grade Components, Dual Ball Bearing, Axial-tech Fan, PCB Coating, 10 Year Warranty)
4.8/5£111.97
CORSAIR CX550 80 PLUS Bronze Non Modular Low-Noise ATX 550 Watt Power Supply - UK - Black
4.6/5£47.99
CORSAIR RM750e (2025) Fully Modular Low-Noise ATX Power Supply with 12V-2x6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – White
4.6/5£84.99
NZXT C750 Bronze ATX 3.1 - Non-Modular Power Supply - 750 Watts - 12V-2x6 Connector - 120mm FDB Fan - Compact 140mm Size - Black
4.5/5£54.9
![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
Asus Prime 750W Gold Gaming PSU, Double Ball Bearing Fan, Fully Modular, 80+ Gold, ATX 3.0, PCIe 5.0
4.5/5£97.99
Sharkoon SilentStorm SFX Gold / 500 Watt fully modular power supply, 80+ Gold
4.5/5£111.49
ASUS ROG Strix 1000W Gold PSU, Power Supply (ROG heatsinks, Axial-tech fan design, dual ball fan bearings, 0dB technology, 80 PLUS Gold Certification, fully modular cables, 10-year warranty)
4.5/5£249.99
Aerocool LUXPRO1000, Power Supply 1000W, 80Plus Gold Certified, Efficiency +90%, Japanese Capacitors 105°C, APFC 14cm FDB Fan, ATX 3.0 and PCIe 5.0, 5 Years Warranty, Black
4.2/5£125.86
Silverstone Cybenetics Gold 1000W ATX 3.0 & PCIe 5.0 Fully Modular ATX Power Supply, SST-DA1000R-GM
4.0/5£175.47
Gigabyte UD1300GM PG5 80 Plus Gold Fully Modular 1300w PCIe 5.0 Power Supply Unit, ATX 3.0, 12VHPWR GPU Connector, Flat Cables, 10 Year Warranty
3.1/5£160.99
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£101.4
