[SOLVED] 750W PSU enough for RTX 3090?

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chasep255

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Dec 13, 2014
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Although I wanted to build a new pc this year I ended up buying a pre-built power spec pc from micro center with an AMD 5900x and RTX 3070. Currently I find the RTX 3070 limiting in what I am doing (deep learning). I want to get a 3090. The power spec pc came with a 750W power spec branded PSU. Will this be enough for the 3090 and my processor? I guess if its not I have an 5 years old 850W PSU in my old pc which is kind of overkill for a GTX 1080 (I used to have a titian for compute in that pc as well.) so I could just do a PSU swap. Or not sure if I want to reuse a PSU that's now a bit over 5 years so I could just buy a new one.
 
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DSzymborski
The EVGA isn't a bad PSU, but it's not really top-tier and the topology FSP uses on this series has issues with transient loads, something which has caused some reported problems with high-end 30 series cards.

In your case, I would absolutely have the same inclination as you do. If I'm spending $3000 on a GPU, I'd rather have a new, top-tier PSU right out of the box. Heck, I got my 3080 at MSRP and at $800, much cheaper, and that's exactly what I did, retiring my EVGA G3 750W from my main rig.
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When you say branded, it's usually the right time to mention the make and model of the PSU, so we can understand what you have to work with. You can work with a 750W PSU but with all the other components in your build, you're better off having headroom, more like an 850W unit as opposed to a 750W unit. As for the 850W 5 year old PSU, after 5 years that unit will not output 850W more like 650W, so that's a no-no as well.
 
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Really have to provide more information. Which PowerSpec model and the exact 850W PSU? The Bronze-rated PowerSpecs aren't very good and I'm certainly not going to recommend using any mystery PSU with a GPU that costs $3000 on the open market now.
 
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The EVGA isn't a bad PSU, but it's not really top-tier and the topology FSP uses on this series has issues with transient loads, something which has caused some reported problems with high-end 30 series cards.

In your case, I would absolutely have the same inclination as you do. If I'm spending $3000 on a GPU, I'd rather have a new, top-tier PSU right out of the box. Heck, I got my 3080 at MSRP and at $800, much cheaper, and that's exactly what I did, retiring my EVGA G3 750W from my main rig.
 
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Solution
DSzymborski said:
The EVGA isn't a bad PSU, but it's not really top-tier and the topology FSP uses on this series has issues with transient loads, something which has caused some reported problems with high-end 30 series cards.

In your case, I would absolutely have the same inclination as you do. If I'm spending $3000 on a GPU, I'd rather have a new, top-tier PSU right out of the box. Heck, I got my 3080 at MSRP and at $800, much cheaper, and that's exactly what I did, retiring my EVGA G3 750W from my main rig.
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What PSU would you recommend?
 
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Most 3090 cards will need two 8 pin aux power connectors.
A quality 750w psu can likely do the job.
If you buy a factory overclocked card with 3 8 pin connectors, that could add up to 150w to your needs.
I have no problem overprovisioning a PSU .
It will allow for a stronger future graphics card upgrade.
It will run cooler, quieter, and more efficiently in the middle third of it's range.
A PSU will only use the wattage demanded of it, regardless of it's max capability.
A quality psu is a long term investment.
Look for a unit with a 10 year warranty.
Here is one list of quality tiers:
linustechtips.com

[EOL] PSU Tier List rev. 14.8

PSU Tier List 4.0 rev. 14.8 (END OF LIFE) Last Update: 27-07-2021 Legend : Gray - EoL/obsolete and/or otherwise not recommended for purchase. Green - small form-factor (gold and blue colors are disregarded due to scarcity of SFX PSUs) Gold - best units in the tier (includes requirements for blue ...
linustechtips.com linustechtips.com
For example 850w seasonic focus:
https://www.newegg.com/seasonic-focus-plus-850-gold-ssr-850fx-850w/p/N82E16817151188
 
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