Best Power Supply Under £80
The power supplies you can buy new for £80 or less, ranked by efficiency rating and cabling. Each price is the cheapest in-stock price we found among the UK shops we check, as of 21 October 2026. Delivery is extra at some shops.
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Channel Well Technology GPX Power Supply, 850W, ATX, 80 PLUS Gold Certified, Fully Modular
850W, 80+ Gold, fully modular
£77.99 at CCL Computers
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MSI MPG A850GS PCIE5 850W PSU 80 PLUS Cybernetics Gold Modular ATX 3.1 PCIe 5.1 Power Supply
850W, 80+ Gold, fully modular
£79.99 at Novatech
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be quiet! Straight Power 11 750W
750W, 80+ Gold, fully modular
£54.99 at Box; also CCL Computers £57.99
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MSI MAG A750GL Modular ATX PSU - 750 W
750W, 80+ Gold, fully modular
£79.99 at Currys; also Overclockers UK £79.99, MSI £79.99, AWD-IT £89.99
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MSI MAG A650GL 650W 80 Plus Gold Rated Fully Modular Power Supply Unit
650W, 80+ Gold, fully modular
£64.99 at MSI; also CCL Computers £70.99
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GameMax 850W Pro Modular 80 Plus Gold Power Supply With 14cm ARGB Fan
850W, 80+ Gold, modular
£62.10 at AWD-IT
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GameMax GX-850W Pro 80 Plus Gold PSU Modular ATX 3.0 PCIe 5.0 850W Power Supply - BLACK
850W, 80+ Gold, modular
£74.78 at AWD-IT
1 other listing of this model (another size or colour) also at £80 or less.
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GameMax 750W PRO RGB 80 Plus Gold Rated PSU Modular Power Supply Unit
750W, 80+ Gold, modular
£51.99 at AWD-IT
How we rank
Best 80 PLUS efficiency rating first, then fully modular over semi-modular over fixed cables (a unit listed only as "modular" counts as semi-modular, because the listing does not say which), then more watts, then the cheaper unit. Units without a readable 80 PLUS rating are left out.
Only power supplies with a photo, a full spec table and a new, in-stock price read in the last two weeks are considered, so a part that is sold out everywhere drops off until a shop has it again. Refurbished and used stock is left out. Prices change through the day: check the shop before you buy. We may earn commission when you buy through a link on a product page; it never changes the order here.