Corsair RMx (2024)
The safe choice for most gaming PCs. Quiet, well made and hard to go wrong with.
- Efficiency
- 80+ Gold
- Modular
- Full
- Standard
- ATX 3
- Form factor
- ATX
- Outputs
- 750 / 850 / 1000W
The verdict
If you want an 850W unit you can fit and forget, this is it. It's the standard RMx with sockets on the end, so it fits almost any ATX case.
HWBusters and KitGuru both rate it highly, with tight voltage regulation, low ripple and quiet running at everyday loads. KitGuru recommends it without reservation for a high-end build. It also has fan failure protection, which plenty of rivals leave out.
Both reviews say it costs more than similar units, and KitGuru found it clearly audible at full load. If you rarely push your PC that hard, you'll hardly hear it.
Corsair RMx (2024) reviews
Both lab tests rate the ATX 3.1 version highly: tight regulation, good ripple suppression and quiet running at everyday loads. Both also say it costs more than similar units.
Both labs agree
- Tight load regulation and good ripple suppression. HWBustersKitGuru
- Quiet at everyday loads, with a quality fluid dynamic bearing fan and a knob to set its minimum speed. HWBustersKitGuru
- Cybenetics Gold efficiency, ATX 3.1 and PCIe 5.1 ready, fully modular. HWBustersKitGuru
- More expensive than competing 850W units. HWBustersKitGuru
Where they differ
- Noise at full load: HWBusters calls it silent overall, while KitGuru found it clearly audible at 850W (37.8 dBA). HWBustersKitGuru
Also worth knowing
- Includes fan failure protection, but the 3.3V rail dips below 3.2V in transient tests and the peripheral connectors are closely spaced. HWBusters
Remember, a good PSU is an investment!RM850x, ATX 3.1 (2024)KitGuruOctober 2024
We recommend this power supply without reservation for a new high end PC build.RM850x ATX 3.1 (3rd gen, 2024), 9/10
igor'sLAB published a version of the HWBusters test, so it isn't counted twice. Reviews tested the 850W model.
Pick your output
- 750WMid-range builds, up to an RTX 5070 Ti class card.Check 750W price
- 850WHigh-end builds, up to an RTX 5080 class card.Check 850W price
- 1000WThe most power-hungry cards, RTX 5090 class.Check 1000W price
Sizes assume a typical processor. Check your build in the wattage guide.
Other Tier A at 850W
- undefined80+ TitaniumCheck price
- undefined80+ GoldCheck price
- undefined80+ GoldCheck price
- undefined80+ GoldCheck price
Specs
| Tier on my list | A · High-end builds |
|---|---|
| Wattages | 750W, 850W, 1000W |
| Efficiency | 80 Plus Gold |
| Modular | Fully modular |
| Standard | ATX 3 |
| Size | ATX |
| Released | 2024 |
Corsair RMx (2024) questions
Is the Corsair RMx (2024) quiet?
At everyday loads, yes. HWBusters rated it silent overall. KitGuru measured under 28 dBA up to 225W, rising to 37.8 dBA at the full 850W, so you'll hear it when pushed hard.
What does the fan knob on the RMx (2024) do?
It sets the fan's minimum speed, so you can choose a fan that always spins gently or one that stays slower until it's needed.
Does the RMx (2024) have fan failure protection?
Yes. HWBusters lists fan failure protection as a plus, which many rivals don't have.
Should I get the RMx (2024) or the RMx Shift?
Get the Shift if your case has room beside the power supply and you want the tidiest cable runs. Get the regular RMx if you want something that fits almost any ATX case.
Which Corsair RMx (2024) wattage should I get?
It comes in 750W, 850W, 1000W. Match it to your graphics card using the output guide above, or the calculator for your exact parts.
Can I reuse cables from my old power supply with the RMx (2024)?
Use the cables that came in the box. Modular cables aren't standard between brands, or even between generations from one brand, and the wrong cable can damage your parts.