Recommend a PSU for 4090

Ravenger · 3 Jan 2023 at 17:35

I'm looking at upgrading my PSU in advance of getting a 4090 at some point, as I currently have a 750w Seasonic PSU which is below minimum wattage but works (just about!) with my 3090.

I'm looking for at least a 1000w PSU, does anyone have any recommendations for a good, efficient, modular PSU that doesn't cost a fortune? (The card is expensive as it is!).

Tetras · 3 Jan 2023 at 19:32

Does your PSU have enough power connectors? If it does, then I'd just try it, because the 4090 isn't actually that crazy on power draw compared to the 3090.

Ravenger · 3 Jan 2023 at 20:56

Thanks, yes it does have enough connectors. I would be undervolting or power limiting the 4090 anyway to reduce noise and power consumption.

That said I could do with a PSU to test a new build for my daughter so was planning to use my old PSU to do that if I did swap it

mickyflinn · 3 Jan 2023 at 21:52

Ravenger said:
Thanks, yes it does have enough connectors. I would be undervolting or power limiting the 4090 anyway to reduce noise and power consumption.

That said I could do with a PSU to test a new build for my daughter so was planning to use my old PSU to do that if I did swap it

So you have the choice wether t go new atx 3.0 psu which comes with the new 16 pin pcie connector or a regular psu.

The new standard can deliver up to 600w while the 4090 will come with an adapter to 3x 8 pin pcie for older psu.

My basket at OcUK:

1 x Gigabyte UD1000GM PG5 1000W 80 PLUS Gold Modular ATX Power Supply (SKU: CA-03F-GI) = £189.95
1 x Corsair RMx Series RM1000x 80 PLUS Gold Fully Modular ATX Power Supply (SKU: CA-268-CS) = £159.95

Total: £360.40 (includes delivery: £10.50)

Tetras · 4 Jan 2023 at 01:10

Ravenger said:
Thanks, yes it does have enough connectors. I would be undervolting or power limiting the 4090 anyway to reduce noise and power consumption.

That said I could do with a PSU to test a new build for my daughter so was planning to use my old PSU to do that if I did swap it

In that case, I really think you'll find that your current PSU is fine, but if it's an excuse for an upgrade then I guess why not?

Haz123 · 4 Jan 2023 at 13:43

If you go with a new ATX 3.0 psu then just be aware that the new 12Vpwr cable is limited in how many watts it will supply in relation to its max wattage. This means a 1000W ATX 3 psu will only supply 450w over the 12Vpwr cable and if you want the full 600w to be available you will need a 1200W+ PSU.

I know you said you are going to limit power but if you get an AIB card they are not loud so you may be tempted to push the watts. Most AIB cards are limited to 450w anyway but the FE and the more expensive premium cards can draw the full 600w.

If you go with an older ATX 2.0 dumb psu the gpu and psu will not communicate and the gpu will draw as much power as it requires. These would be my choices if going with older spec, not much availability or reviews for the ATX 3 psus so if you can wait it will help.

Phanteks AMP 1000W 80 Plus Gold Modular Power Supply

Order Phanteks AMP 1000W 80 Plus Gold Modular Power Supply now online and benefit from fast delivery.

www.overclockers.co.uk

Corsair RMx Series RM1000x 80 PLUS Gold Fully Modular ATX Power Supply (CP-9020201-UK)

Order Corsair RMx Series RM1000x 80 PLUS Gold Fully Modular ATX Power Supply (CP-9020201-UK) now online and benefit from fast delivery.

www.overclockers.co.uk

ShiWarrior · 10 Jan 2023 at 19:22

Haz123 said:
If you go with a new ATX 3.0 psu then just be aware that the new 12Vpwr cable is limited in how many watts it will supply in relation to its max wattage. This means a 1000W ATX 3 psu will only supply 450w over the 12Vpwr cable and if you want the full 600w to be available you will need a 1200W+ PSU.

That doesn't really make sense to me

im currently building a AM5 system, i was getting a PSU 1000W from seasonic
now im confused

Haz123 · 10 Jan 2023 at 22:24

I do not think Seasonic has released any ATX 3.0 psus yet so the 1000w version you are looking at will be an ATX 2.0 model. That model will not have a native 12vpwr connector so you will be using the older standard 8 pin pcie power connectors and either connecting directly to the gpu or if you have a 4000 Nv card you will have to use the adaptor.

If you let us know what exact model you are planning to buy I can try to explain more fully and let you know what to expect.

ShiWarrior · 10 Jan 2023 at 22:27

Haz123 said:
I do not think Seasonic has released any ATX 3.0 psus yet so the 1000w version you are looking at will be an ATX 2.0 model. That model will not have a native 12vpwr connector so you will be using the older standard 8 pin pcie power connectors and either connecting directly to the gpu or if you have a 4000 Nv card you will have to use the adaptor.

If you let us know what exact model you are planning to buy I can try to explain more fully and let you know what to expect.

for me the ATX 3 ones are really expensive
so to me,

Seasonic Focus GX-1000 1000W 80+ Gold Modular Power Supply

Order Seasonic Focus GX-1000 1000W 80+ Gold Modular Power Supply now online and benefit from fast delivery.

www.overclockers.co.uk

one i want

Haz123 · 10 Jan 2023 at 22:33

Ok that is an ATX 2.0 psu so you do not have to worry to much. Plug it all in and the components will draw as much power as they need.

The newer ATX 3.0 psus comunicate with the gpu and dynamically adjust settings on the fly and they are also limited in the power they can deliver via the 12Vpwr connector. You do not have to wrorry about this if you get the above psu.

The psu below is made by Seasonic and based upon the same platform as the Focus , it is almost indentical and cheaper. When I added it to the basket it said just 1 left.

Phanteks AMP 1000W 80 Plus Gold Modular Power Supply

Order Phanteks AMP 1000W 80 Plus Gold Modular Power Supply now online and benefit from fast delivery.

www.overclockers.co.uk

ShiWarrior · 11 Jan 2023 at 09:03

Haz123 said:
Ok that is an ATX 2.0 psu so you do not have to worry to much. Plug it all in and the components will draw as much power as they need.

The newer ATX 3.0 psus comunicate with the gpu and dynamically adjust settings on the fly and they are also limited in the power they can deliver via the 12Vpwr connector. You do not have to wrorry about this if you get the above psu.

The psu below is made by Seasonic and based upon the same platform as the Focus , it is almost indentical and cheaper. When I added it to the basket it said just 1 left.

Phanteks AMP 1000W 80 Plus Gold Modular Power Supply

Order Phanteks AMP 1000W 80 Plus Gold Modular Power Supply now online and benefit from fast delivery.

www.overclockers.co.uk

looking up the Tier list, that one you've linked to is not the same as the seasonic one @ £180
this one is :

Phanteks Revolt Pro 1000W 80 Plus Gold Modular Power Combo Supply

Order Phanteks Revolt Pro 1000W 80 Plus Gold Modular Power Combo Supply now online and benefit from fast delivery.

www.overclockers.co.uk

and its the same price

PSU Tier List rev. 17.0g - Cultists Network

PSU Tier List will help you to choose the best PSU out of hundreds of models on the market. From budget to the highest end Power Supplies.

cultists.network

mickyflinn · 11 Jan 2023 at 12:09

ShiWarrior said:
That doesn't really make sense to me

im currently building a AM5 system, i was getting a PSU 1000W from seasonic
now im confused

Not sure if this helps your decision.

NVIDIA RTX 4090: 450 W vs 600 W 12VHPWR - Is there any notable performance difference?

NVIDIA’s GeForce RTX 4090 requires between 400 and 600 W of power. We pair it with a Seasonic VERTEX GX-1200 to determine whether there is any difference in performance or stability between 450 W and 600 W 12VHPWR connectors.

www.techpowerup.com

Haz123 · 11 Jan 2023 at 13:21

Sorry Shiwarrior I am not sure what you are looking at with that list, the Amp and the Revolt Pro sit next to each other in the Tier A Phanteks PSUs.

My understanding from reading reviews was that the AMP was based upon the Seasonic Focus psu and Seasonic is the OEM. Then the Revolt Pro is based upon the Seasonic Prime psu and Seasonic is the OEM. They are all amongst quality psus and I am sure you will be happy whichever one you go for. Like micky shows with the above video there is very little need to pump stupid amounts of power into any gpu but all of the ones mentioned in this post are ATX 2 and can deliver a lot of power via the pcie gpu cables , 600w if required.

ShiWarrior · 11 Jan 2023 at 13:31

from what i can tell

"Older Seasonic Focus revisions (Focus Gold, Focus Plus Gold / Platinum, made before 2018) had transient sensitivity issues. Some more recent models are not affected because they were released after the fix (Seasonic Focus GM/GX/PX refreshes, Phanteks AMP, NZXT C/E etc.). Although situation with Ampere GPUs is unclear it’s assumed that there are no widespread issues on Focus platform."

the AMP is older. you want the "Pro" version to be sure your getting a better PSU ?

Haz123 · 11 Jan 2023 at 13:40

Sorry dude you are reading it wrong. I will isolate and quote what they have written.

"Some more recent models are not affected because they were released after the fix (Seasonic Focus GM/GX/PX refreshes, Phanteks AMP, NZXT C/E etc.)."

As you can see the Phanteks AMP is listed in the "more recent models are not affected" section.

I would get the Revolt Pro over the Seasonic Focus GX. The Revolt Pro is built upon the higher spec Prime range and for the same money it is a slightly better specced psu. The Amp is very similar to the Focus GX and not effected by any issues as far as i am aware.

Sopp · 11 Jan 2023 at 14:10

Haz123 said:
If you go with a new ATX 3.0 psu then just be aware that the new 12Vpwr cable is limited in how many watts it will supply in relation to its max wattage. This means a 1000W ATX 3 psu will only supply 450w over the 12Vpwr cable and if you want the full 600w to be available you will need a 1200W+ PSU.

...

Do you have a source for the 450w cable limit on 1000w PSUs please?

Edit: Maybe it's on a per product basis, I found this review of a 1000W PCIe5 that comes with a 600W cable: https://www.tweaktown.com/reviews/1...-1000-watt-80-plus-gold-gamers-psu/index.html

ShiWarrior · 11 Jan 2023 at 14:18

found it

Intel's ATX v3.0 PSU Standard Has More Power for GPUs

There is a new PSU standard from Intel, leading to huge changes in the IT market!

www.tomshardware.com

ShiWarrior · 11 Jan 2023 at 14:50

just ordered a phanteks Revolt Pro 1000W

momo56 · 11 Jan 2023 at 14:52

Sopp said:
Do you have a source for the 450w cable limit on 1000w PSUs please?

Edit: Maybe it's on a per product basis, I found this review of a 1000W PCIe5 that comes with a 600W cable: https://www.tweaktown.com/reviews/1...-1000-watt-80-plus-gold-gamers-psu/index.html

Running a Rog Loki 1000W myself and it can pull more than 600W on the 12vhpwr so it's definitely not limited to 1200W+ PSUs.

Haz123 · 11 Jan 2023 at 15:29

momo56 said:
Running a Rog Loki 1000W myself and it can pull more than 600W on the 12vhpwr so it's definitely not limited to 1200W+ PSUs.

How are you measuring the power draw ? Not doubting your findings just curious.

The ATX 3.0 spec appears to have been put together by Intel and Nvidia whilst in their underpants and high on meth. Who knows what is set in stone and what is arbituary and manufacturers are free to ignore. The 450w limit on 1000w psus may be advisory and Asus have just ignored it and let 600w be used over the 12vpwr connector, we will have to wait for more models to be released and see what is actually happening and available.

The electronic engineering in each individual psu is beyond my understanding and I will follow Aris advice from hwbusters on what the good models are.

Recommend a PSU for 4090

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