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Author Topic: Powercolor Myst 7870 (Tahiti LE) Running hot stock clocks  (Read 2977 times)
Meladath
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April 23, 2013, 08:04:25 PM
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Hi guys, just got a powercolor 7870 card for mining (7870XT) and its running really hot. Stock clocks it says are 925 core 1500 memory 975 boost core clock. I am running it at -3 power 950/1400 and its still hitting 84c every now and then (stable at 83) with the fan going up to 70%. Underneath it I have a 6950 dedicated to mining LTC and that is not unlocked (1408 shaders) but its running at +5 power/925 core/1350 mem and at 19 intensity stays at 76c with the fan only being at 56%. Considering the stock clocks of the 6950 are wayyyy before what I have overclocked it to and yet I am underclocking the 7870XT and its still over 80c am I worried, and while it is a sapphire dirt3 edition 6950 so it has 2 fans compared to the 1 on the 7870XT... its still strange

Any info? thanks guys.
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hynodeva
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April 23, 2013, 08:25:25 PM
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I am undervolting my Tahiti LE card to about 1.08 - 1.12v

8°C less temps & 25W less power draw is the result.
It is running stable for weeks.

I would start undervolting with small steps and check the results, so you dont have to worry about your hardware.

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April 23, 2013, 09:25:54 PM
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What clocks do you run it at? which brand and cooler does it have? I cant seem to edit the voltage using MSI afterburner for some reason even though I have checked the option in settings. What would you say is a safe temp? I thought 80 was about right for most GPU's but this seems to run incredibly hot...
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April 25, 2013, 08:04:02 AM
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They've disabled overvolting in afterburner and you have to jump through alot of hoops to get it working - search engine it and there are guides. In addition, some cards are now voltage locked.

As for the high temps, its possible(but not likely) you got a bad thermal paste job, or have an airflow problem.

80 is really not so horrible. My old 8800GT once hit 130 C and lived to tell about it. My old x1950 used to run regularly at 100C when gaming, 75 at idle. I ran that card 24/7 for 6 years straight - it still works. Modern GPU's can really take some heat. They're usually obsolete long before they burn out. I had a Radeon 9800 pro that I bought back in 2003. That card burned out in 2010 only because the thermal paste dried out and the GPU fried. But now I'm rambling like Grandpa Simpson.

My new 7850 runs at 62 C full load (1050/1300 @1.075v) though it has the XFX double dissipation cooler on it. The XFX Double D cooler models are the only ones now with a lifetime warranty.
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April 25, 2013, 11:57:38 PM
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Get Trixx for complete voltage and clock control.

https://www.sapphireselectclub.com/ssc/TriXX/
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May 05, 2013, 04:36:27 AM
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I have an Powercolor 7870 EZ edition with is pretty much the same except for a smaller plastic fan shroud.  The board is on a pcie extender cable and open to 25C ambient air.

1100mhz gpu / 750mhz memory, 100% fan, 1188mv (stock), using AB right now and voltage doesn't show, need to try trixx and see if voltage is accessible.

gpu temp 87-90C
VRM temp 101-105C

488 mhash/s on guiminer with poclbm

So yes runs hot but is stable for me at this elevated temperature.
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