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What's a good OC for Sapphire 7970 OC w/ Boost? - Page 6

post #51 of 58
Quote:
Originally Posted by GabrielQ View Post

I just tried running 1115/1450 @ 1.2v with Unigine Valley instead of FurMark and the VRM temps seems fine...

Much better now, the VRMs are throwing away 5-10W but still pretty darn high for a 100MHz OC but i guess that's the best you can do now biggrin.gif
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post #52 of 58
Thread Starter 
Quote:
Originally Posted by sugarhell View Post

Let it loop 3-4 times.

Hmm I've let it run for more than 40mins and it's still around the same.

post #53 of 58
I believe it is true that FurMark puts an unrealistic load on the GPU and thus higher temps all around. I just tried it with Kombuster as well, if launched from straight from AB the VRMs hit around 80C and climb and the VDDC is crazy high in the 20's. If I just select Kombuster through the programs list or even play a game for about 2 hours, the VRMS and the VDDC are around normal ranges. I believe that your VRMs are fine as long as you don't put an unrealistic load using FurMark or anything other GPU stress test like it. My card even within acceptable temperature ranges of 70C during heavy load Kombuster, the core clock starts to throttle. If I launch the program manually and let it heat up to the same temperatures, it does not throttle. So in the end I will say your card is on the low end of the silicon lottery but at least it overclocks somewhat right? thumb.gif
post #54 of 58
Yeah, why do people run FURMARK? I have no clue, it's unrealistic and does not represent any real videogame scenario.

It just heats up you gpu which cannot be good, and makes it fail when it might have been stable in a real videogame.

I just play videogames to see if overclocks are stable. I would advise doing the same, instead of running furmark. Also 3DMARK e.t.c. usually runs stable but video games do not.
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post #55 of 58
I just recently purchased two of these guys, and they seem to hit 1150 / 1600 with 20% power boost on stock voltage. I am not intending to push them much farther than that until I get a larger power supply. I am currently using a Seasonic X750 at the moment, and trying to decide if I need to jump up to a 1kw+.

I was monitoring GPU-Z and it looks like just the GPU is using around 120-watts on load not including any other board power usage. If that is the case, I think this is a fairly safe load. Any idea how close to the limit I am pushing this power supply? You can see my other system specs in my signature.
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post #56 of 58
If I stress a single 7950 [1250/1900:1.187/1.625 vand i7 3820 4.75:1.4v I get a bit over 620W under load, not accounting for inefficiency losses. Its a 600W CM Silent Pro [Bronze]

So you're almost certainly fine.
post #57 of 58
My 7970's only get up to 1.137 VDDC using the 20% power boost so not sure how they would compare to yours power wise. Are you using a kill-a-watt to measure pull at the wall? Do you have a gold or platinum certified power supply?
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post #58 of 58
Furmark....



doh.gif
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