Rank #7 in Best PC Power Supply 2026: 10 Ranked, and the Specs That Don't Add Up
Corsair RM850e (2025) 850W Fully Modular — White
Price and rating as shown on Amazon when we collected them. Both change.
The Corsair RM850e (2025) is an 850 Watt fully modular ATX 3.1 power supply, listed here in white at £94.99 with 4.7 out of 5 from 50 ratings. It takes the number 7 slot in this guide. Unlike several listings in this category, the numbers on this one do not fight each other: an output wattage of 850 Watts appears twice in the spec table with the same figure, the single 120mm rifle bearing fan described in the bullet text is matched by a spec table listing one fan, and the stated input range of 100 to 230 Volts (AC) does cover the roughly 230V UK mains.
The finding in this listing is a price finding. Corsair gives the white version at £94.99 and the black version at £89.00, then gives both the same 15 x 14 x 8.6 centimetre dimensions and the same 1.53 kg weight — a £5.99 difference that buys the finish and nothing the spec table can distinguish. Everything on this page is taken from the Amazon listing; we have not tested this unit ourselves.
How those 50 ratings break down
An average hides its own shape. This is the spread behind the 4.7 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £94.99 (the black version is listed at £89.00) |
|---|---|
| Rating | 4.7 out of 5 from 50 ratings |
| Rating spread | 87 five-star, 5 four-star, 4 three-star, 3 two-star, 1 one-star (as listed) |
| Output wattage | 850 Watts (as listed, and repeated as 850 watts elsewhere in the same table) |
| Dimensions | 15 x 14 x 8.6 centimetres (the black version carries the same figure) |
| Weight | 1.53 kg (the black version carries the same figure) |
| Input voltage | 100 to 230 Volts (AC) |
| Fan | 120mm rifle bearing, 1 fan |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“excellent power supply, the cables quality is so good, you dont need sperate cables, the gpu cable has comb applied already and it looks stunning. Highlt recommmended”
Verified purchase“Fully modular, comes with all the cables, looks really nice too! Great purchase overall, very happy with it so far!”
What it is up against
The rivals it was ranked against in Best PC Power Supply 2026: 10 Ranked, and the Specs That Don't Add Up.
Questions people ask
Is the white Corsair RM850e different from the black one?
Corsair lists both at the same 15 x 14 x 8.6 cm and the same 1.53 kg, and prices the white version at £94.99 against £89.00 for the black. The finish is the difference the listings show.
How much power does the Corsair RM850e supply?
The spec table gives an output wattage of 850 Watts.
Will the Corsair RM850e run from a UK wall socket?
The listing states a minimum input voltage of 100 Volts (AC) and a maximum of 230 Volts (AC), which covers the roughly 230V UK mains.
What efficiency does the Corsair RM850e carry?
Corsair quotes Cybenetics Gold efficiency. The claim is Cybenetics Gold rather than 80 Plus Gold.
Does the Corsair RM850e include the cable for a modern graphics card?
Yes — the product name lists a 12V-2x6 cable, and the listing states ATX 3.1 and PCIe 5.1 compliance with support for 2x transient power excursions from the GPU.
How does the Corsair RM850e keep noise down?
Corsair states a 120mm rifle bearing fan with a specially calculated fan curve that keeps fan noise down even at full load.
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