4090 Owners & PSUs: Do You Have Something Higher then 650W?

EastCoastHandle

EastCoastHandle

EastCoastHandle

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Knowing that the 4090 is power hungry. And it uses a 4 pigtail connector. In which 3 of them will give you base clocks. While the 4th allows for OC'ing. Do you have a powerful enough PSU that supports the power requirements of the 4090?
It's not completely clear, yet (that I've found) what the base line requirements are for the 4090 but most reviewers settled for a higher end 850W while others wen to the 1600w evga T2.

From the reviews it does appear that the higher end PSU offers the best performance coupled with a top end cpu.
 
You are going to need much higher than a 650w psu and I would most likely be looking at a 1000w unit from a very good brand. Power requirements of the latest cpu's and gpu's are just getting ridiculous now. Things should be getting more efficient not even more power hungry than the previous gen!! The way prices are going with cpu's, gpu's and now motherboards they will kill off pc gaming soon because nobody will be able to afford it or justify it over a console.
 
The fact people are buying that thing amuses me a lot :D working in business I have to say hats of to Nvidia's marketing team to dumb people to this level.


Back on topic, check some videos online as people are bench-marking them @ 750w (quality...not back of a lorry's type) and they work fine. IMHO ATX 3.0 are not even here, some brands said they won't have any until Q1 2023 so really anyone on a decent power supply can hold off, perhaps undervolt the card a bit, or the CPU, instead of creating e-waste by buying a current gen 1000W psu for like 3 months.
 
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If I were to be buying the 4090, I'd only consider to even connecting it to a Seasonic TX700 (Fanless; Titanium, less than 2 years old, 700W so close enough to your 650W proposed, with an overhead to around 900W before protection kicks in), ONLY if the rest of the system was ultra low power draw items (since the 4090 can pull 450-600W from the power connectors, not including transients I believe, realistically leaving 100-250W stable power from the power budget available).

So yeah, as others have said, you're really looking at grabbing a new PSU really if grabbing a 4090; something in the 850W+ region (or better yet, 1k+) as some are saying at the very least. 650W-700W PSUs are not going to cut it without cutting corners elsewhere in your rig, which defeats the purposes of grabbing such a powerful GPU and pairing it with something that can't make the most of it due to them being low power parts.
 
arknor said:
why they only pull like 300-400wat even in demanding games, one of the reviews was done with an 850watt
Click to expand...

Because graphics cards draw a spike of power that can be double their rating. So a card that normally uses 450W can spike at 900W. So in general they recommend a power supply that is double the requirement of the graphics card. A 4090 requires a 900W PSU (850 is close enough!) but some of the overclocked varaties of the 4090 actually specify 1000W. If you are going to buy a new power supply then it would be sensible to buy one that can deliver twice the most powerful the cable can support, which is 1200W.
 
SpellowHouse said:
Because graphics cards draw a spike of power that can be double their rating. So a card that normally uses 450W can spike at 900W. So in general they recommend a power supply that is double the requirement of the graphics card. A 4090 requires a 900W PSU (850 is close enough!) but some of the overclocked varaties of the 4090 actually specify 1000W. If you are going to buy a new power supply then it would be sensible to buy one that can deliver twice the most powerful the cable can support, which is 1200W.
Click to expand...
do you even have one of these cards? one review was done on an 850watt psu it's a fact there's no huge transient spikes
 
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