Upgrade time?? - but those Watt calculators seem overkill?

[ElBurge]

So - i recently upgraded my rig to 5900x and been running a 3090FE for last year and i like to overclock, landing a 20,000 timespy score recently

I have had my trusty Corsair AX860i PSU for the last 9 years and thought it was still going strong. So recently i have ran in to some oddities and i am starting to think its my PSU. Today i started getting random power downs under full load. I pulled all the modular cables out, ran self test a few times, cleared my CMOS, took all my overclocks off etc etc... and it randomly all went back to normal- put all the OCs back and still... normal.

So i am thinking my PSU maybe end of its life - so when researching new PSUs the calculators are telling me i need a 1000W.

So i started logging power draw through intensive applications and i top out with 580W power out 620W power in. So am not right in still thinking 850W PSU is still plenty?

I mean a 5900x is a 100 watt part, plus 400W for the 3090 and then 100w for all the rest of the crap sounds about right? I am struggling to see why 1000w+ PSUs are trying to become the norm again?

I dont plan to SLI my 3090 any time soon and i am already running 4 SSDs a bunch of fans and RGB.

 

[pastymuncher]

Sadly power hungry components are on the rise again and to make things worse Nvidias RTX3000 series cards suffer from power spikes from which the psu may not be able to adapt to in time and results in a shutdown followed by a immediate reboot. Overclocking is going to make things even worse. Reading your symptoms this could very well be what your pc is suffering from. Looking around for deals you can pick up a 1000w psu for the same price or less than a 850w of the same model. OCUK has the 2021 Corsair RM850x at £130 which is the same price as the Phanteks Amp 1000w although out of stock on here. Have a look around and see what quality 1000w psu's you can find at that price or less, I bet there are a few that pop up in stock.

 

[flux64]

i have a friend with a similar build and he is using the RM850x without any issues but if you can pick up a top quality 1000w PSU for the same sort of price or just a little higher i would go for that

 

[Drumroll]

Issue with RTX 3080/3090 is power spikes.
If the PSU isn't 100% or have some good margin, security features will kick in.
Replaced an EVGA 750W with a Corsair 1000W, as the EVGA under load would keep the fan on and the fan was annoying. The Corsair, and its replacements showed coil whine. Went with a Seasonic Focus 850W Platinum and it is superb.
Was more than enough for my 3900x + RTX 3090 and loads of fans and custom loop.
At £130-140 was a very sensible investment.

 

[Rroff]

Seen a fair few systems where if the PSU isn't working at like 110% the 3000 series GPUs expose it. Even with my 3070FE seeing sub-500ms draw spikes which give my 860 watt PSU a work out.