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750w enough for 3090

PhilGQ

PhilGQ

PhilGQ

Associate
Joined
10 Sep 2007
Posts
683
So lucky me managed to snag a 3090FE, 3070 would have been fine but I had a shot at this so I took it.

Anyway my power supply is an EVGA supernova G2 750 Gold.

Looking at the spec it's 12v rail is 62amps and its supposed overclock to 1600w (though that sounds like marketing BS).

Rest of my spec is 3950x, Asus Sonar ext2, one hard disk, two nvme drives and 8 fans including the ones on the CPU.

Mostly game Division 2 being the heaviest game i really play right now. Also do some video editing though can do that on CPU I if it came to it.I

Do you guys reckon I'll be ok? I'd buy a new one but you know, 1400quid light right now.
 
PhilGQ said:
So lucky me managed to snag a 3090FE, 3070 would have been fine but I had a shot at this so I took it.

Anyway my power supply is an EVGA supernova G2 750 Gold.

Looking at the spec it's 12v rail is 62amps and its supposed overclock to 1600w (though that sounds like marketing BS).

Rest of my spec is 3950x, Asus Sonar ext2, one hard disk, two nvme drives and 8 fans including the ones on the CPU.

Mostly game Division 2 being the heaviest game i really play right now. Also do some video editing though can do that on CPU I if it came to it.I

Do you guys reckon I'll be ok? I'd buy a new one but you know, 1400quid light right now.
Click to expand...
Should be fine, i ran mine for a little while on a EVGA GQ 750w. Watt meter from the wall read 650/680w max both overclocked.
 
I’m running my 3090 FE with a 5600X on a 750W Corsair SFX power supply. Had no issues so far although I do run an under volt on the GPU. That’s mostly to keep temps down to be honest.
 
Jay85 said:
Should be fine, i ran mine for a little while on a EVGA GQ 750w. Watt meter from the wall read 650/680w max both overclocked.
Click to expand...

Sounds promising then,

BlueInf said:
You can use a flat power curve to limit the W.

just be aware that the card will reset on GPU crash for example
Click to expand...

So I am not at risk of damaging anything then? How do I mange the power curve, is that In the control panel thing. Had that msi thing on my last AMD card but not looked at power management since I lasted switched to nvidia.
 
PhilGQ said:
Rest of my spec is 3950x, Asus Sonar ext2, one hard disk, two nvme drives and 8 fans including the ones on the CPU.
Click to expand...

10700k with mild oc, 3090FE undervolted 1950/900 in afterburner, 4 ram, nvme +2 SSD, 360AIO, 4 x 140 case fans & some fairy lights.
It'll hit 550w for the system while gaming according to the PSU. Boringly stable.
Less than that rendering with the PSU or CPU at 100%.

You've got a good PSU, should be fine. I've got an old 550G2 running a 4790K and a 2080TI. Also boringly stable.
 
i ran a corsair sfx 750w platinum psu with my 3090 fe, at stock speed with a cpu overclock the psu was perfectly fine, but when i started overclocking the 3090 the psu did get very warm and when i games my pc decided to switch off, i wondered why and when i took the back pannel off the woft of heat from the psu i got, made me back off my oc, i ended up getting a 1kw unit and then a 1200w as i run a big cpu and heavy gpu overclock, a 1kw+ psu is defo needed if you push your clocks.

with a max power target on my fe 3090 is 114%, which was recorded under load in watts of 430w just for the card, i have it now set at 105% but my card still juces over 360w just for the card thats at a 2070mhz core oc and +1100mhz on the ram, dont get me wrong if you run it at stock speed a 750w is perfectly fine, if you overclock then look for bigger wattage, you'll need it 100%

i run a 5950x at 4.65ghz all core too, full custom loop with 6 fans all on a corsair hx 1200w psu
 
wookiee87 said:
i ran a corsair sfx 750w platinum psu with my 3090 fe, at stock speed with a cpu overclock the psu was perfectly fine, but when i started overclocking the 3090 the psu did get very warm and when i games my pc decided to switch off, i wondered why and when i took the back pannel off the woft of heat from the psu i got, made me back off my oc, i ended up getting a 1kw unit and then a 1200w as i run a big cpu and heavy gpu overclock, a 1kw+ psu is defo needed if you push your clocks.

with a max power target on my fe 3090 is 114%, which was recorded under load in watts of 430w just for the card, i have it now set at 105% but my card still juces over 360w just for the card thats at a 2070mhz core oc and +1100mhz on the ram, dont get me wrong if you run it at stock speed a 750w is perfectly fine, if you overclock then look for bigger wattage, you'll need it 100%

i run a 5950x at 4.65ghz all core too, full custom loop with 6 fans all on a corsair hx 1200w psu
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I’m assuming you switched away from SFF? Not aware of any 1200W SFX PSUs.
 
Maybe if you undervolt your stuff or at best keep it stock

I have a overclocked 5950x and overclocked RTX3090 Strix - my PSU pulls 850w from the wall when I run 3D Mark Timespy* :D

* I do have a bunch of other stuff in the case which contributes to the wall power draw like pump, lots of fans, lots of rgb
 
I wasn't really thinking of Overclocking at the moment so looks like I should be fine. Looks like most people are managing pretty well on 750w as long as the PSU is a good brand.

It will still likely be my next upgrade but doesn't look like I need to rush.

Thanks guys
 
PhilGQ said:
I wasn't really thinking of Overclocking at the moment so looks like I should be fine. Looks like most people are managing pretty well on 750w as long as the PSU is a good brand.

It will still likely be my next upgrade but doesn't look like I need to rush.

Thanks guys
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you should be fine. Stock 3090 and stock cpu while gaming you shouldn't be drawing more than 600 to 650w ish watts so 750w is fine - but yeah it's psu depending, some people just get unlucky or have old psu.

if you did run into any issues, the good news is that the 3090 is an excellent undervolter - you should be able to save 50w to 80w for just 2-4% performance loss so undervolt got is a great idea for those at the edge of stability and a 3090 inch inning 2-4% slower is still faster than the 3080. Some people get lucky with their undervolt and can even save 50w for absolutely no performance loss
 
running mine off an 850Watt not a single issue.

I would say watch out with how many storage drives you might have attached to the system.
 
So far so good, not really thrashed it yet, ran about a bit in Division 2 on ultra and hit the range on Overwatch on epic. Don't think it broke a sweat but it didn't insta-die or catch fire so that's a good start.

First impressions it runs very quiet, does this thing start to make noise when it's under stain?
 
PhilGQ said:
So far so good, not really thrashed it yet, ran about a bit in Division 2 on ultra and hit the range on Overwatch on epic. Don't think it broke a sweat but it didn't insta-die or catch fire so that's a good start.

First impressions it runs very quiet, does this thing start to make noise when it's under stain?
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I’ve yet to hear mine while gaming.
 
I have the same PSU and it seems fine so far, although I've only had the 3090 a couple of days. Max power draw I've seen from my fe is 350w during a benchmark, only noise I've heard it making is coil whine!
 
PhilGQ said:
First impressions it runs very quiet, does this thing start to make noise when it's under stain?
Click to expand...

At 100% the fans reach dustbuster noise levels. If you've got anything like decent case airflow it'll be inaudible.
Playing with mine it seems to target 70 core and 100 vram before the fans start to really spin up.
 
I used my 750w seasonic for a while but had an undervolt curve to be sure. This knocked off 50w during use.

I jumped on a reasonably priced 850w phanteks not many weeks back which will cover the 3090 needs. Moved the 750w into my server machine as I sold a 600w on.
 
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