Worried an RM850x isn’t enough :-(

Reality Bites · 26 Nov 2022 at 19:25

Just putting a build together around a ryzen 5800x and b550 mb.

I ordered the RM850x thinking I’d be adding a 3080 or 3080 ti so should be enough.

Anyway, went stupid and ordered a 3090ti (evga ftw black for what it’s worth).

Is the 850w gonna cut it?

jimmy321 · 26 Nov 2022 at 20:32

It will be fine I was running 13900k + 4090 with RM860.

CapitalOne · 26 Nov 2022 at 20:33

Yep no problem, my system with a 4090 etc pulls max 600w (from iCue).
One of my others pulls more or less the same with a 3090 and that has an 850w PSU.

Reality Bites · 26 Nov 2022 at 20:37

Kinda good to hear…..I’ve not had the 850 delivered yet so have the chance to swap to a 1000.

I may even just send the card back, depends if I find a 3080 somewhere for a non crazy price

clone · 27 Nov 2022 at 09:53

Yeh it's OK I ran a overclocked 12600kf and EVGA 3090 TI with the same psu.

Tetras · 30 Nov 2022 at 22:16

Steve used that PSU in his review of the 4090, it didn't blow up

(30:46)

GeForce RTX 4090 Review, Nvidia's Stupid Fast GPU!

Support us on Patreon: https://www.patreon.com/hardwareunboxedJoin us on Floatplane: https://www.floatplane.com/channel/HardwareUnboxedBuy relevant products ...

youtu.be

Reality Bites · 30 Nov 2022 at 22:50

I’ve used loads of online calculators and I get recommendations from 750 to 1000w! Crazy variations.

i know the 850 should be enough but I’ve also ordered a 1000w …l for the sake of an extra £35, thought it would cover me for the future too. I’m going to be running a few usb devices from it as well as a good few fans. I’ll keep looking, worst case, I have to send either the 850 or 1000 one back.

one thing I was worried about was the “spikes“ which systems can have and accounting for those too?

Tetras · 30 Nov 2022 at 23:13

Reality Bites said:
one thing I was worried about was the “spikes“ which systems can have and accounting for those too?

It's the main reason why you're recommended excessive PSUs nowadays, I think, despite the actual power usage of most systems being way less than what you're quoted. For the most part, decent modern PSUs can cope with the spikes, I can only remember the original Seasonic Focus (and other PSUs based on the same platform) having major issues. Nvidia was supposed to have designed different behaviour with Lovelace, I think (more stable/less spikey, GN tested it (12:23) and Igorslab.