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HELP!!! 7970 Crossfire OC

post #1 of 4
Thread Starter 
Hi Guys,

I am confused & having issues getting a stable and safe OC on my two HD 7970's.

I was able to get them both running at at 1220 / 1600 on 1.3 volts using sapphire trixxx and play all games without crash (even bf3 multiplayer for 2 / 3 hours. However when i do a burn-in 1080p furmark stress test i start to see artifacts after a few minutes. When i back the clocks down to 1180 and the memory to stock they seem to run beautifully on furmark as well.

Temps seem okay, even at 1220 / 1600 core temps stay under 70 for all games. VRM's stay under 110 Celsius

So my question is will running these cards above that 1180 / 1500 limit damage the cards? Even if they are in a sense stable. I would be happy just to have 1200 on core stock memory

Would reallly appreciate some advice as this is driving me completely mental.

Thanks in advance

Dave
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post #2 of 4
furmark is a extreme workload. the big issue is furmark pushes the chip to its thermal limits. the higher temps affect your OC stability. furmark is ok if you have watercooling. otherwise just check with games like crysis 3, bf3, farcry 3, tombraider and benchmarks like 3dmark 2013 and heaven 4.0.

also try and keep VRM temps under 95c. don't push them above 100c. increase fan speed to keep core temps around 70c and VRM temps around 90 - 95c. i would suggest reducing voltage and seeing if you can run at 1150 - 1175 mhz at 1.25v. remember the last 50 - 75 mhz is not worth it if it comes at a very high power / heat / temps cost.
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post #3 of 4
Thread Starter 
thanks for your reply raghu.

on stock voltage i'm able to run both cards at 1160 on the core and 6000mhz on the memory, without any furmark artifacting. should just be grateful for that as it's pretty impressive in itself

it's a psyche thing that i must get both cards running at 1200 completely stable. these cards have spoiled me lol

your absolutely right, cranking the voltage to get an extra 5% really isn't worth it considering the money and time i put into these things.

appreciate your time m8
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post #4 of 4
Quote:
Originally Posted by sat1va View Post

thanks for your reply raghu.

on stock voltage i'm able to run both cards at 1160 on the core and 6000mhz on the memory, without any furmark artifacting. should just be grateful for that as it's pretty impressive in itself

it's a psyche thing that i must get both cards running at 1200 completely stable. these cards have spoiled me lol

your absolutely right, cranking the voltage to get an extra 5% really isn't worth it considering the money and time i put into these things.

appreciate your time m8

i would say 1150 mhz at stock voltage is pretty good. stick with those settings. the overall focus should be on a optimum balance of perf, temps, fan noise with complete and rock solid stability. thumb.gif
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