RM850x vs RM1000x

gymleader · January 20, 2022

I'm trying to decide on which PSU to go for now and into the future. Hardware will be a high end AMD CPU (5950x) and high end Nvidia GPU (3070/3080 level or whatever the 4070/4080 ends up being).

I know the common answer is "get the higher wattage PSU" which makes sense but the more I looked around, it seems like the RM1000x isn't talked about as much as the RM850x. PCP also has the RM850x as the way more popular choice.

From what I read Corsair never put out a 2018 model of the RM1000x (no idea why). Currently it was only the 2015 model available until the 2021 model came out. I only have access to buying the 2015 RM1000x or the 2018 RM850x.

I can see pros and cons for both. If I did happen to get a 3090 this thread discusses how that GPU was shutting down a system with the RM850x but some unspecified 1000w model didn't: https://forum.corsair.com/forums/topic/165178-rm850x-shuts-down-from-3090-fe-power-spikes/

However to combat that someone with the exact CPU I plan to get has people saying the RM850x will be fine with even the 3090 FTW3 ULTRA from EVGA which I would assume spike higher than the FE edition:

Does the 1000w model being 2015 mean it's inferior in build quality/components to the updated 2018 850w? The price between them isn't that drastic (especially considering the rest of the build) so I just want to get what would be deemed the "community preferred" option.

Quackers101 · January 20, 2022

depends on what the whole 4000 gpus would be like.

else it would just be an 850, unless you are adding more to the system.

dizmo · January 20, 2022

Higher is better. I'd go for the higher one just for peace of mind.

The 4000 series so far has been rumoured to take more power than the 3000. So. There's that.

Juular · January 20, 2022

2 hours ago, dizmo said:

The 4000 series so far has been rumoured to take more power than the 3000. So. There's that.

PCIe 5 also includes 3.2kW transients in the spec so most current production PSUs regardless of wattage may not be able to sustain that. IIRC @jonnyGURU said that they were testing this out, not sure if RM1000x passed. So there's that.