Corsair RM850e ATX 3.1 (2025) PSU Review

1. Introduction2. Bundle & Cabling3. External4. Internal5. Testing Methodology and Results6. Closing Thoughts7. View All Pages

The Corsair RM850e is a decent performer in our tests over the last week, although I was slightly more impressed with the RM1000e I reviewed a short while ago. I also think that with the £10 price reduction Corsair have applied to the RM1000e (to around £150) that it provides a little more potential future proofing if you decided to upgrade down the line to a more powerful graphics card and processor.

I mentioned in my last video that the RM1000e would be a good partner for the new RTX50 series of cards and the RM850e is no different – you would just need to ensure you don't decide to partner it up with a new RTX5090 as we found in our launch review that this card can demand close to 600 watts of power (READ HERE). Combine this with a power hungry processor and you would be asking for problems. In the real world the RM850e would be better suited to the upcoming 5070ti.

Our review of the new Nvidia RTX5080 is live very soon as we publish this review and in theory it will demand in and around 350-400 watts so the RM850e should work fine. You just need to weigh in the demands of whatever processor you may be using as well.

This unit coped well with our cross load test and load regulation was pretty good across the rails – with just a dip visible on the +3.3V rail. Nothing that would cause any issues, just worth mentioning. Also we feel the +12 rail could deliver slightly better noise suppression at the higher end of the power demand graph, but again this is well within industry rated parameters so we are splitting hairs.

The MSRP for the RM850w is £124.99 (HERE) in the United Kingdom (other prices are listed on the first page of this review if you are outside the UK). Personally I would rather spend the extra £25 and get the RM1000w which is on offer for £152 (HERE).

Pros:

• Great load regulation.
• Rifle bearing fan is relatively quiet for most of the load demand.
• Soldering quality is high.
• efficiency is good.
• cable quality is great.
• fully modular.

Cons:

• Fluid dynamic bearing fan option would be nice.
• Taiwanese Teapo primary cap.
• 7 year warranty could be a little better.

Kitguru says: The RM850e power supply will make a good partner for a new 5070 ti or 5070 graphics card. It is built to high standards at a fairly reasonable price point in the UK at around £125. 

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