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Problems when overclocking 780 TI in SLI

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  • Overclocking
Last response: in Overclocking
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September 14, 2014 9:16:59 AM

I overclocked my 2x ZOTAC 780 TI OC in SLI. I tried to raise the temp to 87 degrees Celsius, 1080 core clock speed (overclocked from 941 base clock) and 1825 memory (1750 core). It was fine, I had score 3774 with max settings in Heaven benchmark 1920-1080 resolution. Now when I ran the benchmark again with increased core clock (1100), the screen turned off just before the end of the benchmark. Sound was playing in the background but the screen was black. I also tried to reconnect the screen to see if that would help, but it didn't. I tried to click turn off button on my PC and nothing happened. I pressed it again, and nothing happened. I then unplugged the PC from the wall. I turned it on again and I downclocked to 1085 clocks. Still the same problem. I'm now running it at 1080 clocks, 1825 memory and it seems to be doing fine, however the benchmarks were 3774 and now they're 3560 or something like that. I hope I haven't damaged my graphic card?

(The card runs at almost 1200 clocks for some reason as well, but that doesn't concern me. It can be seen in GPU-Z software)

After all these problems, I turned off the computer, allowed benchmark to run for about 3 minutes, and then I started testing. This time I turned on Turbo (additional 140mm fan) and it went through the benchmark and the score improved somehow to 3784... I mean my graphic card isn't overheating or anything. Average temperature is about 75-80ish. I don't use water cooling, but I've got lots of fans.

More about : problems overclocking 780 sli

a c 424 K Overclocking
September 14, 2014 10:57:01 PM

What PSU, mobo and CPU?
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a c 424 K Overclocking
September 15, 2014 11:21:23 AM

GPUs are like CPUs no two are exactly the same, and some OC much better than others and a few much worse than others, it might be one is on the weaker side and holding back the second one
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September 15, 2014 2:40:35 PM

I have 2x ZOTAC 780 TI OC (exactly the same graphic cards but in SLI)
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a c 424 K Overclocking
September 15, 2014 3:06:26 PM

Yes, understand, but in SLI both need to be able to run at the same speeds, if one tops at 1085, then that's the fastest easch will run, even if the second is capable of faster - sort of like DRAM all run at the same freq and timings
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September 15, 2014 3:42:05 PM

Both were overclocked to the same speeds.
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a c 424 K Overclocking
September 15, 2014 5:03:22 PM

Sounds like you hit the wall at 1100, can try more voltage or try with the memory slightly lower, as far as scores they are going to vary from one run to another
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September 15, 2014 5:07:35 PM

Yeah I was thinking that I overclocked memory a bit too high. Probably memory caused it, I'll check it thanks!
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a c 424 K Overclocking
September 15, 2014 5:17:55 PM

Keep us updated ;) 
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