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GPUZ Is this not good

Petrolhead

Petrolhead

Petrolhead

Associate
Joined
7 Jul 2008
Posts
1,336
Location
Newcastle upon Tyne
Under PerfCap Reason (set to Show highest Reading)

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Someone suggested that my cars, 3090, 850W PSU, is being performance capped?
 
It's normal for Ampere cards to have perfcap resason as power. Card is limited at 350W and its using that so nothing to do with your PSU. Depending on your model you may be able to up the limit by an extra 15% for example or you could try undervolting so it can hit higher clocks at the same power use. Some can have BIOS flashed to higher limits also.
 
stooeh said:
It's normal for Ampere cards to have perfcap resason as power. Card is limited at 350W and its using that so nothing to do with your PSU. Depending on your model you may be able to up the limit by an extra 15% for example or you could try undervolting so it can hit higher clocks at the same power use. Some can have BIOS flashed to higher limits also.
Click to expand...
Thanks, I am running this :
Zotac GeForce RTX 3090 Trinity OC 24GB GDDR6X PCI-Express Graphics Card
 
Petrolhead said:
Thanks, I am running this :
Zotac GeForce RTX 3090 Trinity OC 24GB GDDR6X PCI-Express Graphics Card
Click to expand...

According to techpowerup bios page that card should be able to go to +10% for 385W total and since you are watercooled it should be easy enough to handle. Though your hotspot delta looks pretty high so it might be worth a reseat/repaste :)
 
If possible, it might be worth finding out how often it's hitting the power limit. If it's doing so very rarely then the effect on performance will be low. If it's doing so very often the effect on performance will be high. If that image is only showing the highest reading, it might well show perfcap if it's happened at all because the reading can only be 0 (didn't happen at all) or 1 (it happened). Or maybe the solid green bar indicates constant perfcap. I don't know.

Power draw has had the largest effect with graphics cards I've had in years. My last 3 cards have all banged frequently against the power cap at stock and undervolting has a significant effect on reducing power draw and therefore on perfcap due to power draw. In the most extreme case (a Radeon 7950, some while back now) I got huge gains in temp and performance solely from undervolting. Somewhere in the region of 20% performance improvement and 30% temp improvement. I forget the exact numbers, but they were in that ballpark. Didn't change the clocks at all. That was an extreme case, though. The card was obviously seriously over-volted by default.
 
I think the solid green does indeed indicate constant power perfcap, not sure what the purpose of MAX is on that particular setting though :p
Frequency is pretty low so an undervolt might be a good bet, not sure what 3090s can generally hit at 900-930mV ?

My 3080 hits the power limits hard especially at 4K. Need to try quake 2 RTX to see what it pushes my clock speeds down to...
 
Thanks for the replies

That snapshot was taken when playing Automobilista 2 with 20 AI

Re the MAX setting, that's what I was told to set it to, is this incorrect advice?

The build is about a year old. Reseating is possible but a bit out of touch now regarding thermal pastes, any suggestions?

The card is running std setting, i dont want to flash the bios however, should I undervolt (how?) it or change anything else?
 
Petrolhead said:
Thanks for the replies

That snapshot was taken when playing Automobilista 2 with 20 AI

Re the MAX setting, that's what I was told to set it to, is this incorrect advice?

The build is about a year old. Reseating is possible but a bit out of touch now regarding thermal pastes, any suggestions?

The card is running std setting, i dont want to flash the bios however, should I undervolt (how?) it or change anything else?
Click to expand...

This vid should cover the basic idea, not much to it really


As for paste I read in another thread Syy157 is a good bet for GPUs if your paste has suffered 'pump out' after a year of thermal cycles but I am yet to try it myself. My previous loop saw hot spot temps rise from 15 to 25 over an 8month period but I never saw the thread until I just re did it with MX-4. We will see how it holds up :)
 
stooeh said:
This vid should cover the basic idea, not much to it really


As for paste I read in another thread Syy157 is a good bet for GPUs if your paste has suffered 'pump out' after a year of thermal cycles but I am yet to try it myself. My previous loop saw hot spot temps rise from 15 to 25 over an 8month period but I never saw the thread until I just re did it with MX-4. We will see how it holds up :)
Click to expand...
Thanks, will have a watch
 
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