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Sapphire 5870 running hot?

post #1 of 13
Thread Starter 
So here is my concern:

I have a reference Sapphire 5870 without overclock, but overdrive unlocked.

While gaming I accidentally discovered some high temperatures near sensor #3 shown by GPU-z and AMD GPU clock tool alike.



Is it normal for some areas of the GPU to be that hot, and what could I do to even out the differences in temperatures?


According to Catalyst control centre, everything seems to be normal with automatic fan control: general GPU temps shown as 70*C (I consider it average after 3h of Battlefield 3 everything ultra) and under full load the Fan speed tops at 30%.
It idles @ 21% and with temperatures of ~35*C

When I enable manual fan control it responds as expected (Somehow I can only enable manual Fan control with Overdrive also enabled)
However, with higher RPM-s the noise becomes really loud and clear (intolerable after 80% fan speed) and temps go lower. Still sensor #3 is a fraction higher than first two sensors, but GPU-Z and AMD clock tool display different results.


AMD GPU clock tool displays same high amplitude between temperatures of sensors #1, #2 compared to sensor #3
Under full load 2 sensors display 70*-75* but third sensor rarely drops below 99*


I must note, that I have never seen my PC shut down because of graphics card and no artifacts or GPU glitches have never occurred. Should I do something about it since I don´t usually like my GPU boiling inside my case.
post #2 of 13
70C is normal, that's not an issue, as for the 100 one, not sure about that.

The fan speed at 30% at idle is fine as well. If you run furmark see how hot it gets, if it goes above 85c then i'd probably look into another cooling solution.

Comps
post #3 of 13
The third temp sensor is very likely the VRM temp. It isn't unusual to see VRM temps of about 100°C, nor is it something that should scare you. They usually run at these temps and can take 125°C, but without changing the stock cooler you can't really get them any lower while keeping the noise level reasonable. My 5850's VRMs dropped below 90°C after installing the Accelero S1r2, now they never go over 60°C.
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Centurion
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post #4 of 13
Thread Starter 
Quote:
Originally Posted by dragosmp View Post
The third temp sensor is very likely the VRM temp. It isn't unusual to see VRM temps of about 100°C, nor is it something that should scare you. They usually run at these temps and can take 125°C, but without changing the stock cooler you can't really get them any lower while keeping the noise level reasonable. My 5850's VRMs dropped below 90°C after installing the Accelero S1r2, now they never go over 60°C.
So the Vram has greater tolerance and doesn´t boil @ 100*C. So how long is it safe to run it near 100*C temps?

That´s a bit of a relief, but how can I be sure it actually is Vram sensor, and not any other part of my GPU chip with poor thermal paste.

I am currently starting up Furmark for stability, but which test should I do. There are Burn-in, Extreme Burn-in, Post FX. Need some guidelines.

Only possible cooling alternative for me is air due to cost and availability issues.

+1 rep
post #5 of 13
Quote:
Originally Posted by Kilkin View Post
So the Vram has greater tolerance and doesn´t boil @ 100*C. So how long is it safe to run it near 100*C temps?

That´s a bit of a relief, but how can I be sure it actually is Vram sensor, and not any other part of my GPU chip with poor thermal paste.

I am currently starting up Furmark for stability, but which test should I do. There are Burn-in, Extreme Burn-in, Post FX. Need some guidelines.

Only possible cooling alternative for me is air due to cost and availability issues.

+1 rep
Do xtreme burn in, no Post FX

Also if it was another part of your card hitting 100C then you would be getting artifacts and your machine would be crashing.

The aftermarket aircoolers are very good, cost effective and very simple to install.

Comps
post #6 of 13
He said VRM not Vram. Voltage Regulator Module. Dont let the vram cook lol.
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post #7 of 13
Thread Starter 
Quote:
Originally Posted by RainMotorsports View Post
He said VRM not Vram. Voltage Regulator Module. Dont let the vram cook lol.
My bad, I am still a beginner in acronyms. I got those things mixed up. SO VRM it is.
post #8 of 13
Thread Starter 
So I did the Extreme Burn in (8xMSAA; 1 min ; 1920x1080)

Max results are as follows:

GPU sensor #1: 76,5*C
GPU sensor #2: 76,5*C
VRM sensor: 121,5*C


Results are shown here aswell
http://www.ozone3d.net/benchmarks/fu....php?id=214058
post #9 of 13
Those temps are perfectly fine

Furmark is an extreme program designed to make GPU's hit the highest temp possible, you'll never reach these temps in day to day gaming or activities.
post #10 of 13
...just a followup, though comps and the others covered these things too.

I think 121 is far too high even for VRMs. 125°C is about as high as they should ever get and I wouldn't aim straight in games knowing the card is cooking like that. That said Furmark is a completely unrealistic load so in games likely it doesn't climb that high. If after a gaming session the VRMs would be @120°C you should seriously think of improving the cooling somehow. You asked "how do I know that's the VRM?", there are two ways: first as comps said if the GPU or RAM would be over 100°C the card would artifact and crash; secondly when running a test and monitoring the 3 temps you'll notice two temps rising faster and one slower - the two fastest are (99%sure) in order: GPU and RAM/PCB, the slowest rising / flattest slope represent the VRM. It sounds silly to have to deduce it like that, but there's no other way I'm aware of and this should work.

As an alternative aircooler the Accelero S1r2 is good if you can still find it (maybe ebay) or the Accelero TwinTurbo. It shouldn't be more than 30$ and it makes a hell of a difference, but removing the stock heatsink usually voids warranty.
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Centurion
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