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3090 secret memory PerfCap

Grim5 said:
Miners are reporting even higher temps, generally miners said they are seeing 100 - 110c on the memory junction temp in HW Info and this happens on both 3080 and 3090.
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I see VRAM temps of 74c while gaming but during some downtime mining temps sit at around 96C on my 3080 ventus so mining definetly pumps up the memory temps on these cards.
 
3090 FE will clip 110 no problems while mining, and can still maintain under the thermal throttle trigger at +1050 memory. During games iike warzone it seems to sit about 86.
 
Acolyte said:
3090 FE will clip 110 no problems while mining, and can still maintain under the thermal throttle trigger at +1050 memory. During games iike warzone it seems to sit about 86.
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That seems quite low! Is that with the stock cooler? GPU temp?

Mine settles at 98 or 100 on Watchdogs Legion and Timespy Stress Extreme Test, with a 65c or less GPU temp and 50 percent fans
 
Vertically mounting, depending on the case may help, specially if there's fans under the GPU.
Using the O11 AIR + Phanteks Vertical GPU Mount, the maximum temperature under stress dropped only 2C for the GPU Core, 70C now, but the maximum T Junction of memory was 78-80C which, considering the numbers around, it's satisfactory.
As others mentioned, a flat backplate doesn't offers much surface.
Something like the Enzotech heatsinks (round, long and cooper) should allow better use of airflow from any direction.
I was looking for the Alphacool ones, but they're like lines, so the airflow has to come from the top or the same direction of the gaps.
Just waiting for summer, and if things go south, I may try the Enzotech, as airflow inside the case is almost a wind tunnel.
 
Grim5 said:
why? Your 3090 already has a heatsink on the back - it's called the backplate. The problem is there is no where for the heat to go, you're better off sticking fans on the back of the card you will get a much better result
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Because mining on it holds MJT at 108-110 which i am not happy about for long term longevity so i'm spending a small outlay to improve things? The blackplate is a hopeless heatsink it has a tiny relatively small thermal mass, i have a 120mm fan pointed directly onto it and it does sweet FA to improve it.
 
Acolyte said:
But it just isnt (For mining anyway)........
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Oh hang on I assumed the FE had good cooling and you were on an AIB version. Are you going to stick them fins hoping it increases the surface area enough for fans to make more difference? I would like to see the before and after numbers but I think it wouldnt make much difference.

Your ambient temp would help having that low, but generally a warm enclosed case is the barrier typically which is why mining farms have them exposed with just fans blowing air in one direction.
 
Adding heatsinks would draw the heat away from the memory and back plate, providing you have good contact from back plate to heatsinks. mounting a fan to blow on the heatsinks would help cool, what differences you would see is subjective to case air temp.
a combination of more airflow plus heatsinks making good contact has to be advantageous to reducing memory heat.
 
I made the modifications last night. I took the backplate off and replaced the VRAM pads for Thermalright Oddessy pads. I then mounted the heatsink on top with large thermal pad (also Thermalright Oddessy) and rested the fan back on top to provide breeze.

Before it was 108-110 sustained JT while mining (70% case fan, 70% gpu fan speeds), now its averaged 101.2 degrees over the past 12 hours of mining (70% case fans, 50% gpu fan speeds), so a saving of approx 8-9 degrees on average and has stopped all thermal clipping, and it is considerably quieter. I still want it to be in the 90's but i can appreciate the heatsink i selected although being a good slab of thermal mass, needs more surface area to be more effective. i'll have another look for a more traditional copper CPU type heatsink with a lot of fins and see if i can improve further.
 
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My 3090 over heats at 105C, I've stuck on a getto cooler fun with a fan flowing to it lowering it to about 100C. Doesn't thermal throttle, but definitely heats insane.
 
I think the ones from alphacool or enzotech, as being pure copper ones, should help a bit more. I'm tempted to see here. Any idea how thick the thermalpads for a reference card should be?
 
MrPotato said:
What a legend. Thanks. Will order some trusty Gelid GP Extreme.
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I ordered some Thermaltake Extreme Odyssey after seeing that post. They're still in the post from overseas though, so I've stuck with the standard pads on the Corsair waterblock for now. Will be interesting to do a before and after!
 
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