Worried an RM850x isn’t enough :-(

Soldato
Joined
28 Jul 2003
Posts
5,801
Location
South Wales
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?
 
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?
 
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