PC power supply buying guide: what wattage and which features (UK)
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The PSU is the part people skimp on and one of the parts most often behind whole-system failures. Here's how to choose, with one verified mainstream option.
Corsair RM750e (2025)
Fully modular, Cybenetics Gold, native 12V-2x6 and a 7-year warranty.
Pros
- Fully modular
- ATX 3.1 with a native 12V-2x6 connector
- 7-year warranty
- 105°C capacitors
Cons
- 750W is more than low-power builds need
Key specifications
Corsair RM750e (2025)
- 750W
- fully modular
- Cybenetics Gold
- ATX 3.1 / PCIe 5.1 with native 12V-2x6
- 105°C capacitors
- 7-year warranty
Source: retailer listing
Checked 20 Oct 2026 at Scan
Analysis
Sizing: add GPU board power to CPU power, then allow about 40% headroom. Graphics card makers publish a recommended PSU size; follow it.
Must-haves: a known brand and model with independent efficiency certification, a long warranty, and the right GPU connectors without adapters.
Reliability and upgrade notes: cheap unbranded PSUs are a well-known cause of 'everything died at once' failures. A 7-year warranty is a strong signal the maker expects it to last. Never reuse modular cables from a different PSU brand, because the pinouts differ and can destroy drives.
Verdict
A well-specified 750W unit for most single-GPU gaming PCs.
Price history
Recorded checks for Corsair RM750e (2025): 20 Oct 2026: £109.99 at Scan. A chart appears here once we have recorded at least four dated checks. We never estimate or back-fill history.