Radeon 7870 Overclock is Unstable!?!?

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remo220

remo220

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May 3, 2012
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I posted earlier today but got no responses so I'm posting again. Ok so I have a HIS 7870 which has at stock, 1000 core clock and 1200 memory clock. Also the stock voltage is 1219. So what I did was I increased the core clock to 1175 and the memory clock to 1400. This was unstable so I increased the voltage to 1264 which worked fine on bf4 for a while but then crashed so I upped the voltage to 1288 which worked good for a few games too but then started to crash! Is my voltage too high, do I have to tone back one of my clock speeds, or both? And does Overvolting actually improve stability?

P.S. I increased the board power by 20%. It was stable on Kombustor and Uningine at 1264 core voltage, 1175 core clock, and 1400 memory clock, but I never tested it on Kombustor or Uningine at 1288 core voltage, 1175 core clock, and 1400 memory clock.
 
Solution
Kingbob
There is no theoretical max for the speed of your memory and clock (it will eventually get to hot and will melt, but if it doesnt get to hot it can overclock forever). Most people recommend not overclocking the memory much because it wont improve the performance as much as the clock speed. You want to do it in slow increments

Heres a good article explaining how to overclock:
http://www.pcworld.com/article/250644/how_to_overclock_your_graphics_card.html
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Kingbob

Kingbob

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Basically, how GPU overclocking should be done, is you want to up the core clock and then memory clock separately one by one and run a good GPU stress test until they fail. Then you need to up the voltage until the test doesnt fail at that speed. Then you know you have a stable overclock. You can repeat the process to achieve high overclocks. You want to stop overclocking the card when it is too hot when running the benchmarks or it is too loud for your liking.
 
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remo220

remo220

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But when I find the max stability of the core clock, to find the max for the memory clock, do I set the core clock back to stock or leave it where it is? And in my case, would upping the voltage to 1300 mV (the max on Afterburner) be a good idea and add stability?
 
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Kingbob

Kingbob

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Apr 30, 2013
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There is no theoretical max for the speed of your memory and clock (it will eventually get to hot and will melt, but if it doesnt get to hot it can overclock forever). Most people recommend not overclocking the memory much because it wont improve the performance as much as the clock speed. You want to do it in slow increments

Heres a good article explaining how to overclock:
http://www.pcworld.com/article/250644/how_to_overclock_your_graphics_card.html
 
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Solution
remo220

remo220

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May 3, 2012
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Ok thanks a lot! Quick question though: why is it that cards do become unstable? Like, why will it become unstable and crash?
 
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Kingbob

Kingbob

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The become unstable if one of the following occurs:

1. The card overheats and melts the circut
2. The card doent have enough voltage and shuts down because it is not getting enough power
3. The card cant handle the amount of voltage you are pushing through and it shorts the circut
 
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