10-04-2012, 08:44 AM
Hi!
Some news from my side.
I was able to trace these errors to the "GPU Boost" function of the NVIDIA 6xx series.
Basically, I noticed that right before the crash, there is a spike in the GPU frequency and voltage.
As you know, the 6XX series include a feature called "GPU Boost". This dynamically changes (overclocks) the GPU clock depending on the workload. In my case, with the 690, it would go from 915MHz to 1019MHz. The jumps also depend on the GPU temperature and cooling, so it generally is a random looking curve.
I tried all sorts of tricks from decreasing the frequency, voltage, RAM freq and so on, but in the end, turning off the GPU boost did the trick. Here's a guide on how to do it:
http://www.overclock.net/t/1267918/guide...dervolting
Since doing this, no more 999/700 errors for me. The card is cracking sha512 hashes at a bit over 21,000 c/s, at a temp of about 78-79 C per GPU.
I recommend you try the same, maybe it works for you as well.
Some news from my side.
I was able to trace these errors to the "GPU Boost" function of the NVIDIA 6xx series.
Basically, I noticed that right before the crash, there is a spike in the GPU frequency and voltage.
As you know, the 6XX series include a feature called "GPU Boost". This dynamically changes (overclocks) the GPU clock depending on the workload. In my case, with the 690, it would go from 915MHz to 1019MHz. The jumps also depend on the GPU temperature and cooling, so it generally is a random looking curve.
I tried all sorts of tricks from decreasing the frequency, voltage, RAM freq and so on, but in the end, turning off the GPU boost did the trick. Here's a guide on how to do it:
http://www.overclock.net/t/1267918/guide...dervolting
Since doing this, no more 999/700 errors for me. The card is cracking sha512 hashes at a bit over 21,000 c/s, at a temp of about 78-79 C per GPU.
I recommend you try the same, maybe it works for you as well.