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The RTX 4090 is incredible with just a 60% POWER limit

I saw the der8auer vid and it seems like a no brainer.

Two questions:
1 - Are there any long term risks to the card with this?
2 - Would this allow this card to be used with a 750w PS (Understandably not 100% best plan).
 
perosus said:
I saw the der8auer vid and it seems like a no brainer.

Two questions:
1 - Are there any long term risks to the card with this?
2 - Would this allow this card to be used with a 750w PS (Understandably not 100% best plan).
Click to expand...
1. Don't know yet but I did hear that undervolting really isn't a thing with this card.
2. I seriously doubt it because of the amount of power require just to turn it on. If nvidia mandates a higher wattage it's for a legit reason.
 
I think undervolting and limiting you could go as low as about 80% before the performance began to dive on the 3090. 60% seems quite a lot so would be interesting to see how that affected ray traced titles and pushing the card.
 
I'd actually love for a round up of all undervolting results in one thread somewhere: Ada, Ampere, RDNA2 and RDNA3.

With stable clocks, max power at those settings, performance loss, etc. all in one thread.

Was pretty scared by the spikes for both AMD's and Nvidia's top ends (6900 XT, 3090, 4090 etc.) but now that last gen is not that bad price-wise used, I have wondered if they could be permanently tamed with a vBIOS undervolt/underclock and work with a 650-850W PSU without any tripping.

Don't mind losing upto ~10% performance if that means being able to run a 300W+ card at 200W or less. With AMD's drivers Chill feature the card might even use less.
 
EastCoastHandle said:
1. Don't know yet but I did hear that undervolting really isn't a thing with this card.
2. I seriously doubt it because of the amount of power require just to turn it on. If nvidia mandates a higher wattage it's for a legit reason.
Click to expand...

Whilst true ive done some basic testing comparing the 3080 to the 3090 Ti.

3080.
Full system idle - 130W
Full system load - 510W

GPU board Power draw / Power, W.
Idle 16W
Max 325W

3090Ti
Full system idle - 130W
Full system load - 680W

GPU board Power draw / Power, W.
Idle 27W
Max 491W

Fully system is measured at the wall using a power meter plus. It includes (PC, 34" monitor & speakers)

I wouldnt recommend it, but I think most could get away with a 750W PSU. Nvidia will no doubt be covering their asses saying 850W minimum
 
Guest2 said:
Whilst true ive done some basic testing comparing the 3080 to the 3090 Ti.

3080.
Full system idle - 130W
Full system load - 510W

GPU board Power draw / Power, W.
Idle 16W
Max 325W

3090Ti
Full system idle - 130W
Full system load - 680W

GPU board Power draw / Power, W.
Idle 27W
Max 491W

Fully system is measured at the wall using a power meter plus. It includes (PC, 34" monitor & speakers)

I wouldnt recommend it, but I think most could get away with a 750W PSU. Nvidia will no doubt be covering their asses saying 850W minimum
Click to expand...
That's a nice start, but the spikes the professional reviewers report on are measured at the 20ms level (well TPU's W1zzard and Igorslab) and it's those which might trip a PSU up.
 
Linus did some testing and ran a 4090 perfectly fine on a 750w, even ran one on a 650w after lowering the voltage/power limit.

A decent 750w should be fine, my SF750 for example, shows in reviews that it allows up to 930w before the protection kicks in.

A good 750w will be better than a standard 850w
 
from what I read for 4090
- lower power limit is mainly for max power, so if a game is avg down near 300-350w then there's no effect compared to stock
- adjusting power curve causes some other issues, it adjusts other partially hidden voltage settings and lowers performance more than expected
- going too low can cause stutter issues

alternatives
- cap frame rates, lots of non-twitch games feel great down near 100 which is pretty easy on older games for a 4090
 
gpuerrilla said:
I think undervolting and limiting you could go as low as about 80% before the performance began to dive on the 3090. 60% seems quite a lot so would be interesting to see how that affected ray traced titles and pushing the card.
Click to expand...
It's not always the titles you expect which actually push the GPU the hardest. Out of the games I've tried, it's A Plague Tale: Innocence of all things which causes by far the highest power draw. Using a 3070 at 1890MHz/900mV, Cyberpunk 2077 with ray tracing enabled pulls 160-170W, versus 195-205W for APTI.
 
Aretak said:
It's not always the titles you expect which actually push the GPU the hardest. Out of the games I've tried, it's A Plague Tale: Innocence of all things which causes by far the highest power draw. Using a 3070 at 1890MHz/900mV, Cyberpunk 2077 with ray tracing enabled pulls 160-170W, versus 195-205W for APTI.
Click to expand...

I can't think of any games that push both a modern CPU and GPU hard at the same time

For a 750w PSU to be a problem, both the GPU and CPU would need to be maxed out and I can't think of a single game which does that... People keep saying "the 4090 pulls 500 watts and the CPU pulls 250 watts, then you have the rest of the system" etc. But in reality, they don't both pull full power at the same time. At least, not that I've seen. I maybe wrong, in which case somebody will likely correct me. But the only time I've maxed my CPU and GPU at the same time is when I got bored waiting for my PC to finish encoding a movie in x265 so decided to try playing a game at the same time
 
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