Best Overall Value
Price: £146.45 | Rating: ★★★★½ (4.6)
Here's the thing: when you're spending serious money on a GPU like an RTX 4080 Super or RTX 5090, skimping on the power supply is a false economy. The RM1000x is the unit that makes the most sense for 2026 builds, and it's not hard to see why. It's ATX 3.1 compliant, carries a native 12V-2x6 connector (no dodgy adapters needed), and supports PCIe 5.1. That matters if you're buying a current-gen or next-gen graphics card.
The Cybenetics Gold efficiency rating is worth a mention too. Cybenetics is arguably a more rigorous testing body than the standard 80 Plus programme, so this certification carries real weight. In practice, the RM1000x runs cool and quiet. The fan barely spins up under moderate loads, and even under sustained gaming sessions it stays impressively subdued.
Build quality is proper decent. The fully modular cable system means you only plug in what you need, which makes cable management in tighter cases much easier. Corsair backs this with a 10-year warranty, which tells you something about how confident they are in the internals.
At around £109, it's not cheap. But for a 1000W, fully modular, ATX 3.1 compliant unit with a native 12V-2x6 connector, it's genuinely competitive. This is our top pick in the Best Corsair Power Supplies UK 2026 roundup for good reason.
Pros
- ATX 3.1 and PCIe 5.1 compliant for future-proofing
- Native 12V-2x6 connector, no adapter needed
- Cybenetics Gold efficiency, more rigorous than standard 80 Plus
- Fully modular for clean cable management
- Very quiet under typical gaming loads
- 10-year warranty
Cons
- Over £100, so not for tight budgets
- 1000W is overkill for mid-range builds
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Best Under £50
Price: £47.99 | Rating: ★★★★½ (4.6)
Under £40 for a Corsair PSU. That's what the CX550 offers, and for a lot of people that's exactly what they need. This is the entry point of Corsair's current CX lineup, and it's aimed squarely at budget office builds, basic gaming rigs, and anyone upgrading an ageing system without wanting to spend a fortune.
Let's be honest about what you're getting. It's non-modular, so you'll have a bundle of unused cables stuffed somewhere in your case. It's 80 Plus Bronze, which is fine but not efficient enough to justify running 24/7 under heavy load. And the "Non Low-Noise" label in the name is Corsair being upfront: this fan isn't whisper-quiet. Under load, you'll hear it.
But for a PC that's used for browsing, light gaming, or office work? It's sorted. 550W covers most mid-range GPU and CPU combinations without breaking a sweat. The build quality is acceptable for the price, and Corsair's 5-year warranty provides some peace of mind.
If you're building a PC for a family member or putting together a budget gaming rig around something like an RTX 3060, the CX550 does the job. Just don't expect it to be silent or to win any efficiency awards.
Pros
- Very affordable entry point
- 550W suits most mid-range builds
- 5-year warranty for peace of mind
- Corsair brand reliability
Cons
- Non-modular, cable clutter is inevitable
- Audible fan under load
- Bronze efficiency only
- Not suitable for high-end GPU builds
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Best Under £100
Price: £59.99 | Rating: ★★★★½ (4.6)
The CX750 sits in a sweet spot for budget-conscious builders who need a bit more headroom than the CX550 offers. At around £57, you're getting 750W of Bronze-rated power, which is enough to comfortably run a mid-to-high-end gaming setup including GPUs up to the RTX 4070 Ti territory without pushing the PSU too hard.
Like the CX550, it's non-modular and the fan isn't particularly quiet. Those are the compromises you make at this price. But 750W gives you breathing room for future upgrades, and that's genuinely useful. Buy a 550W unit today and add a better GPU next year, and you might find yourself needing a new PSU too. The CX750 sidesteps that problem.
Owner feedback on this unit is generally positive. People appreciate the wattage-to-price ratio and the fact that it just works without drama. It's not exciting. But a PSU shouldn't be exciting. It should be reliable, and the CX750 is that.
One thing to note: if you're spending £57 on a non-modular Bronze unit, it's worth asking whether stretching to a Gold-rated fully modular option makes more sense long-term. For most people building a single system that won't change much, the CX750 is fine. For enthusiasts who tinker regularly, look higher up this list.
Pros
- Good wattage for the price
- Enough headroom for most gaming builds
- Corsair reliability at a budget price
- 5-year warranty
Cons
- Non-modular design
- Fan noise under load
- Bronze efficiency, not Gold
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Best for Beginners
Price: £48.99 | Rating: ★★★★½ (4.6)
This is the CX650 variant that actually has low-noise credentials, which makes it a better choice than the older CX650 (B06WWFKH4V) for anyone who cares about system noise. At under £50, it's a sensible pick for first-time builders who want something straightforward and quiet enough for a bedroom setup.
The 650W output covers a wide range of builds. Pair it with something like an RTX 4060 and a mid-range CPU and you'll have plenty of headroom. Installation is simple because everything is fixed, so there's no fiddling with which cables to attach. For a beginner, that's actually a plus. Fewer decisions, fewer mistakes.
The low-noise fan is a meaningful upgrade over the standard CX models. It won't be silent, but it's noticeably quieter under light to moderate loads. For a budget unit, that's a genuine selling point.
The main limitation is the non-modular design. You will have spare cables to deal with. But at this price, that's expected. Overall, for someone building their first PC and wanting a reliable, reasonably quiet PSU without overthinking it, this CX650 variant is a solid starting point.
Pros
- Low-noise fan, better than standard CX models
- 650W suits a wide range of builds
- Simple installation, good for beginners
- Affordable price point
Cons
- Non-modular, cable management is harder
- Bronze efficiency only
- Not suitable for high-end GPU builds
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Best Build Quality
Price: £124.99 | Rating: ★★★★½ (4.7)
The HX1000 is an older unit now, but it's still one of the best-built PSUs Corsair has ever made. Platinum efficiency, fully modular, 1000W, and backed by a 10-year warranty. The internals are top-tier, and it shows in how quietly and consistently it operates.
The main caveat is that it predates ATX 3.1 and PCIe 5.1, so if you're buying a brand-new RTX 5090 or similar, you'll need an adapter for the 16-pin connector. That's not ideal. But for builds using current-gen GPUs with standard connectors, it's a non-issue.
At around £125, it's priced competitively for a Platinum-rated 1000W unit. The build quality genuinely is exceptional. The cables are high quality, the modular connections feel solid, and the fan is near-silent under typical gaming loads. This is a PSU you buy once and forget about for a decade.
For anyone who prioritises long-term reliability and efficiency over having the latest ATX standard, the HX1000 earns its place in any best Corsair power supplies UK 2026 list. It's not the flashiest option, but it's one of the most dependable.
Pros
- 80 Plus Platinum efficiency
- Exceptional build quality and component quality
- Fully modular with high-quality cables
- Very quiet operation
- 10-year warranty
Cons
- Not ATX 3.1 compliant, needs adapter for PCIe 5.0 GPUs
- Older design compared to newer HX1000i
Buy on Amazon£124.99
Proven Budget Pick
Price: £69.82 | Rating: ★★★★½ (4.7)
This is the older CX650 model, and it's been around long enough to have a solid track record. At around £70, it's not the cheapest option in the CX range anymore, which makes it harder to recommend over the newer CX650 variant (B0CJRXX5WT) that offers low-noise operation at a lower price.
That said, if you find this on sale or you specifically need a unit with a proven long-term reliability record, it's a reasonable choice. The 650W output is versatile, the build quality is acceptable, and Corsair's support is generally good if something goes wrong.
The non-modular design and Bronze efficiency are the same limitations you'll find across the CX range. Nothing surprising there. But compared to the newer CX models, this one feels a bit dated and overpriced at its current listing. Worth buying on a deal. Not worth paying full price when better alternatives exist in the same family.
Pros
- Proven long-term reliability record
- 650W covers most mid-range builds
- Corsair brand support
Cons
- Older design, newer CX650 variants are better value
- Non-modular
- Bronze efficiency only
- Priced higher than newer alternatives
Buy on Amazon£69.82
Best Smart PSU
Price: £200.99 | Rating: ★★★★½ (4.5)
The HX1000i is what happens when Corsair takes the already-excellent HX1000 and brings it fully up to date. ATX 3.1 compliance, PCIe 5.1 support, a fluid dynamic bearing fan, and iCUE software integration for real-time power monitoring. It's a proper enthusiast PSU.
The iCUE compatibility is genuinely useful, not just a gimmick. You can monitor voltage, wattage, and fan speed directly in Corsair's software, which is handy for diagnosing issues or just keeping an eye on your system's power draw. The fluid dynamic bearing fan is ultra-quiet, noticeably more so than standard sleeve bearing fans.
At around £161, it's significantly more expensive than the RM1000x. The Platinum efficiency and iCUE integration justify some of that premium, but for most users the RM1000x will be the smarter buy. The HX1000i makes most sense if you're already deep in the Corsair iCUE ecosystem and want everything talking to each other.
Pros
- ATX 3.1 and PCIe 5.1 compliant
- iCUE software integration for power monitoring
- Ultra-quiet fluid dynamic bearing fan
- 80 Plus Platinum efficiency
- 10-year warranty
Cons
- Significantly more expensive than the RM1000x
- iCUE software adds complexity some users won't want
Buy on Amazon£200.99
Best 850W Option
Price: £124.26 | Rating: ★★★★½ (4.8)
The RM850x is a well-regarded unit that sits between the RM750 and RM1000x in Corsair's lineup. 850W of Gold-rated, fully modular power. It's quiet, reliable, and the build quality is solid. For a high-end gaming build that doesn't quite need 1000W, it's a sensible middle ground.
The main thing to note is that this unit doesn't have ATX 3.1 compliance or a native 12V-2x6 connector. So if you're pairing it with a very new GPU, you'll need to use an adapter. That's worth factoring in. For builds using GPUs from the RTX 3000 or 4000 series with standard connectors, it's a non-issue.
At around £132, it's priced fairly for what it offers. The 10-year warranty is reassuring, and owner feedback is consistently positive. A good choice if 850W is your target wattage and you want Gold efficiency with full modularity.
Pros
- 850W suits high-end gaming builds
- 80 Plus Gold efficiency
- Fully modular
- Quiet operation
- 10-year warranty
Cons
- No ATX 3.1 compliance
- Needs adapter for PCIe 5.0 GPUs
Buy on Amazon£124.26
Best Gold 750W
Price: £463.40 | Rating: ★★★★½ (4.8)
The 2021 RM750 is, in principle, an excellent PSU. Gold-rated, fully modular, quiet, and well-built. It's the kind of unit that belongs in a mid-to-high-end gaming build without question. But here's the problem: the current Amazon listing price is eye-watering. We're talking over £400 for a 750W Gold PSU, which is frankly absurd.
This is almost certainly a marketplace pricing anomaly or a third-party seller inflating the price. The RM750 should cost somewhere in the £80 to £100 range when priced sensibly. At the listed price, it's impossible to recommend. Check other retailers like Scan, Overclockers UK, or Box for a fair price before considering this one on Amazon.
If you can find it at a normal price, it's a genuinely strong performer. But based on the current Amazon listing, skip it and look at the RM1000x or RM850x instead for better value.
Pros
- Gold efficiency, fully modular
- Quiet and reliable when priced fairly
- 10-year warranty
Cons
- Current Amazon listing price is wildly inflated
- Better value alternatives available at normal pricing
- No ATX 3.1 compliance
Buy on Amazon£463.40
Best High-Wattage
Price: £257.92 | Rating: ★★★★☆ (4.4)
1500W. That's a lot of power. The HX1500i is aimed at a very specific audience: people running dual-GPU setups, extreme overclocking rigs, or workstations with multiple high-power components. For everyone else, it's overkill.
But if you do need that kind of headroom, this is a superb unit. ATX 3.1 compliant, PCIe 5.1 ready, Platinum-rated, and with the same fluid dynamic bearing fan and iCUE integration as the HX1000i. It's whisper-quiet even under significant load, which is impressive for a unit this powerful.
At around £385, it's a serious investment. But for the right build, it's the right tool. If you're running an RTX 5090 alongside a high-core-count CPU and multiple NVMe drives, the HX1500i gives you the headroom to do it properly.
Pros
- 1500W suits the most demanding builds
- ATX 3.1 and PCIe 5.1 compliant
- Ultra-quiet fluid dynamic bearing fan
- iCUE software integration
- Platinum efficiency
Cons
- Very expensive
- Overkill for the vast majority of users
Buy on Amazon£257.92
Best Extreme Build
Price: £484.99 | Rating: ★★★★☆ (4.4)
The AX1600i is Corsair's flagship. 1600W of Titanium-rated, digitally controlled power. It uses a digital architecture that allows for incredibly precise power delivery and real-time monitoring. The efficiency figures are exceptional, and the build quality is in a different league from anything else in this roundup.
At nearly £485, it's not a PSU you buy because you need it. You buy it because you want the absolute best, or because you're running a workstation that genuinely demands this level of power delivery. For gaming builds, even extreme ones, the HX1500i or RM1000x will do the job at a fraction of the cost.
The AX1600i is also an older unit now, predating ATX 3.1. So despite its premium positioning, you'd need adapters for the latest GPUs. That's a notable limitation at this price. Still, as a statement of engineering, it's impressive. And for the right use case, nothing else in Corsair's range touches it.
Pros
- 80 Plus Titanium, the highest efficiency rating available
- Digital architecture for precise power delivery
- 1600W for extreme multi-component builds
- Exceptional build quality
Cons
- Nearly £500, extremely expensive
- Not ATX 3.1 compliant despite premium price
- Overkill for virtually all gaming builds
Buy on Amazon£484.99
White Aesthetic Builds
Price: £590.91 | Rating: ★★★★½ (4.8)
White PSUs are genuinely popular for all-white builds, and the RM850x White is one of the few options Corsair offers in that colourway. The specs are solid: 850W, Gold-rated, fully modular, and quiet. But the current Amazon listing price of nearly £486 is completely unjustifiable for a 2018 unit.
This is another case of marketplace pricing gone wrong. The RM850x White should cost somewhere around £100 to £130 when priced sensibly. At the current listing, you'd be paying more than the AX1600i-adjacent territory for a six-year-old Gold-rated unit with no ATX 3.1 support. That makes no sense at all.
If you want a white PSU, check Scan or Overclockers UK for a fair price. At the right price, it's a decent unit. At the current Amazon listing, it's a hard pass.
Pros
- White colourway for aesthetic builds
- 850W Gold-rated, fully modular
- Quiet operation
Cons
- Current Amazon listing price is wildly inflated
- 2018 design, no ATX 3.1 compliance
- Much better value available elsewhere
Buy on Amazon£590.91
