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What's the recomemded 7970 OC voltage?

post #1 of 17
Thread Starter 
Hey guys,

What's the OC voltage sweetspot for a 7970 for 24/7 use? I was thinking 1250mv would be safe for 24/7 if temps allow, is this correct? Also what voltage is the redline (ex 1.3v?) that should not be used for more than afew minutes.

Thanks in advance thumb.gif
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post #2 of 17
1.3V is the absolute maximum the card will allow without modding, most people run at 1.25V or less for a 24/7 OC. 1.3V is fine as long as your temps are under 70 degrees.
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post #3 of 17
Thread Starter 
Quote:
Originally Posted by AndyM95 View Post

1.3V is the absolute maximum the card will allow without modding, most people run at 1.25V or less for a 24/7 OC. 1.3V is fine as long as your temps are under 70 degrees.
Thank you sir thumb.gif

Guess i'll see what this thing can do at 1.2 then slowly move up to 1.25.

hoping for ~1200Mhz+ as my final OC.
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post #4 of 17
You'll probably have no problem keeping the core temperatures in check, but take care of the VRM temps as well. They rise much faster than core temps when o/cing.
post #5 of 17
Thread Starter 
Quote:
Originally Posted by glina View Post

You'll probably have no problem keeping the core temperatures in check, but take care of the VRM temps as well. They rise much faster than core temps when o/cing.
What's their limit? The highest i've seen so far is 71c
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post #6 of 17
Quote:
Originally Posted by th3illusiveman View Post

What's their limit? The highest i've seen so far is 71c

you are safe. keep VRM temps below 90c and core temps below 70c. 1200 mhz is the sweet spot for tahiti. beyond that the power and heat/temps increase is disproportionate to perf increase.
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post #7 of 17
Thread Starter 
Quote:
Originally Posted by raghu78 View Post

you are safe. keep VRM temps below 90c and core temps below 70c. 1200 mhz is the sweet spot for tahiti. beyond that the power and heat/temps increase is disproportionate to perf increase.
Something is wrong with my Heat sinks again.

ran 3dmark at 1.225mv and Vrm1 went up to 90c, Vrm2 was only 66c and the GPU was at 51c
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post #8 of 17
Quote:
Originally Posted by th3illusiveman View Post

Something is wrong with my Heat sinks again.

ran 3dmark at 1.225mv and Vrm1 went up to 90c, Vrm2 was only 66c and the GPU was at 51c

http://www.xbitlabs.com/articles/coolers/display/arctic-accelero-xtreme-7970_5.html#sect1

its possible because the main body of the arctic xtreme 7970 cooler does not make contact with the VRM heatsinks. the cooling is only based on air blown by fans onto vrm heatsinks. what are your core clocks ? the fans on the arctic xtreme 7970 are very silent. push the fan speed to 70%. see if that makes an improvement in VRM temps.
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post #9 of 17
Thread Starter 
Quote:
Originally Posted by raghu78 View Post

http://www.xbitlabs.com/articles/coolers/display/arctic-accelero-xtreme-7970_5.html#sect1

its possible because the main body of the arctic xtreme 7970 cooler does not make contact with the VRM heatsinks. the cooling is only based on air blown by fans onto vrm heatsinks. what are your core clocks ? the fans on the arctic xtreme 7970 are very silent. push the fan speed to 70%. see if that makes an improvement in VRM temps.

i was thinking about doing this.

On the default 7970 cooler there is a black heat spreader that goes over the VRMs, the memory chips and afew capacitors. What if i put that thing back onto the PCB then put the white heatsinks that came with the accelero onto the that.

So it would be PCB VRMs>Stock Thermal Pad> Stock Heat spreader>Accelero Heatsinks> Air from the fans.

pics
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post #10 of 17
i don't think it will work. you could try the stock heat spreader instead of the vrm heatsinks. it should work. the stock heatspreader is quite effective. as i said try and get some very good thermal pads like fujipoly extreme. the air blown by the xtreme 7970 combined with quality thermal pads and stock heatspreader should cool memory and vrm effectively.
Edited by raghu78 - 2/16/13 at 12:00am
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