Clock speed dropping
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Message boards : Number crunching : Clock speed dropping

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Ryan Munro
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Message 20434 - Posted: 6 May 2015, 22:23:27 UTC

Ok so this is a odd one, hoping someone can help.

I have noticed that when I fire up Collatz the clock speeds for the memory on my graphics card drop from 1785MHz to 1502 MHz, any thoughts on why this might be happening? the CPU speed stays as it should though?

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Message 20436 - Posted: 7 May 2015, 5:36:25 UTC - in response to Message 20434.

Ok so this is a odd one, hoping someone can help.

I have noticed that when I fire up Collatz the clock speeds for the memory on my graphics card drop from 1785MHz to 1502 MHz, any thoughts on why this might be happening? the CPU speed stays as it should though?


Could it be slowing itself down due to the temperature being too high?

Ryan Munro
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Message 20440 - Posted: 8 May 2015, 9:49:10 UTC - in response to Message 20436.

Nah its well cooled, just checked it with other projects seti ect and getting the same results, under furmak which is going to stress it more than any other app I get no slowdown.

It does not fluctuate either which throttling would do, it just drops it to that speed.

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Message 20442 - Posted: 8 May 2015, 17:43:41 UTC - in response to Message 20440.

Are you reserving a CPU core, or at least a half a one, to it? Are you running with a customized Collatz config file?

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Message 20444 - Posted: 9 May 2015, 5:00:47 UTC

I believe that due to Collatz running as integer math it is pushing the card in ways not used by other programs (single/double precision floating point).

I am not sure, but I suspect that with the quicker gating operations of integer math the chip is pushing through higher voltages (or rather less electrical resistance than float operations). To compensate the card reduces the voltage to keep from over powering the circuitry.
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