PSU requirements for 4090

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JGF111 said:
if you are thinking of a 4090 *and* a new power supply (which is a good idea), you would be best served waiting for the deluge of ATX3.0 supplies which should be available on shelves before the end of the year.
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This was the info I was looking for - so no ways that my current PSU is ATX 3.0 if they are not even available yet! Just watched Jays2cents video on the PSU+40 series GPU's....I'm still slightly confused as mine can push out 2000W on the +12V rail according to the specs, so technically more than enough for a 1x600W GPU (Currently running 3x2080's), but looking at the standards (- Comply With ATX 12V. V2.2, EPS 12V. V2.91 & SSI EPS 12V. V2.92 Specification), it appears to be ATX 2.2? I'm unsure if I *have* to replace it, as it cost quite a bit and is only a year old! (I currently have 6 PCIe power cables coming through, btw, no splitters)
 
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VortexA1 said:
Nvidia recommends an 850W solely for the 4090
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FTFY :p

but in all seriousness the new 13th gen and ryzen 7k series cpus will draw some wattage as well
230w for the ryzen 7950x and 350w for an oc 13900k (250w at PL2)
for the 4090 a tdp of 450w, i'd expect transients to be in the range of 600w
that's 700w for just the cpu + gpu not accounting for transients nor for any other component in the system + rgb bling bling

think if going ultra high-end for next gen will require at least a 1kw ATX v3 PSU
 
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What I don't get is, if they are selling it with a splitter, which they have to since no single PCIe cable can deliver 600W, and that splitter is melting due to the current draw, then it doesn't matter if your have a 2000W dumb PSU (like my 2000W SuperFlower) or a new "clever" PSU of a suitable wattage....its still the same current getting pulled through the splitter.....so if that can't handle it, well...I'll wait and see what happens with the first people to get 4090's :-D
 
I think these YT are talking CRAP ! Nvidia know people don't have these 3.0 PSU yet ! The 4090 have been built to run on the current gen PSU thats a fact ! So all this crap about cables melting is BS
I have 850W Seasonic and Im 100% sure its going to run my New MSI 4090 with no issues when I order one.
 
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jasonsony735 said:
I think these YT are talking CRAP ! Nvidia know people don't have these 3.0 PSU yet ! The 4090 have been built to run on the current gen PSU thats a fact ! So all this crap about cables melting is BS
I have 850W Seasonic and Im 100% sure its going to run my New MSI 4090 with no issues when I order one.
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I had a quick peruse around of the youtube videos about this. And it looks like the issue doesn't happen often, and requires a user to have basically bent their power cable for the gpu all out of whack through many uses to have forced pins out of place to cause shorts that'll eventually melt and cause fires (which is basically ANY cable from the PSU really, so it's not really exclusive to the 4090 and 3.0 spec specifically, except in theory it shouldn't happen as often or at all on the 3.0 ones). I don't think any of the videos I saw said that no current non 3.0 PSU can run a 4090 otherwise; they're fully expected to be able to run (power) it. Just the question of how easy this potential fire hazard can crop up is the eyebrow raising part; some suggest its super easy, barely an inconvenience. Others aren't as sure.
 
jasonsony735 said:
I think these YT are talking CRAP ! Nvidia know people don't have these 3.0 PSU yet ! The 4090 have been built to run on the current gen PSU thats a fact ! So all this crap about cables melting is BS
I have 850W Seasonic and Im 100% sure its going to run my New MSI 4090 with no issues when I order one.
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How do you know that for sure though? It's not the first NVIDIA card that sparked flashes. Some of EVGA's 10 series set off sparks in 2016. There was an issue with the 9 series? Something related to drivers? Or was it older than that.
 
VortexA1 said:
Nvidia recommends an 850W for the 4090

www.pcinvasion.com

Does the Nvidia GeForce RTX 40 Series require a new PSU?

With the Nvidia GeForce RTX 40 Series graphics cards coming soon, will you need to shell out extra money for a new PSU just to use the card?
www.pcinvasion.com www.pcinvasion.com
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jasonsony735 said:
I think these YT are talking CRAP ! Nvidia know people don't have these 3.0 PSU yet ! The 4090 have been built to run on the current gen PSU thats a fact ! So all this crap about cables melting is BS
I have 850W Seasonic and Im 100% sure its going to run my New MSI 4090 with no issues when I order one.
Click to expand...

V F said:
How do you know that for sure though? It's not the first NVIDIA card that sparked flashes. Some of EVGA's 10 series set off sparks in 2016. There was an issue with the 9 series? Something related to drivers? Or was it older than that.
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I've had my CPU maxed encoding video whilst at the same time had my 3080 maxed mining ETH or playing a game. My 750w didn't bat an eyelid, only barely warm air coming from the back of it.
The way I see it, no game I play (or that I can think of) maxes out my CPU, so there is no reason why a decent 750w shouldn't be enough to run the 4090 (the FE one at least).

To back this up, Nvidia recommend 850w, but there are some terrible 850w PSUs out there and a decent 750w will be better than an average 850w
Hell, reviews have even said my SFX 750w can output 950w before it shuts the power off, so the odd spike over 750w shouldn't cause an issue imo.

On another note, can't see any ATX 3.0 PSUs being released before the 4090 so everybody will be using adaptors on them at first and once people see them running ok they'll probably not bother going and grabbing a new PSU
 
jasonsony735 said:
I think these YT are talking CRAP ! Nvidia know people don't have these 3.0 PSU yet ! The 4090 have been built to run on the current gen PSU thats a fact ! So all this crap about cables melting is BS
I have 850W Seasonic and Im 100% sure its going to run my New MSI 4090 with no issues when I order one.
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yea it's rubbish to get people to look at a video.

it's only a risk if you unplug and replug the cable a bunch of times and deform the pins or scrape the coating off them
 
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