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Message boards : Graphics cards (GPUs) : add a third gpu and the calculation dropped

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philalux
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Message 51722 - Posted: 24 Apr 2019 | 19:17:35 UTC

Hello,

I have 2 gpu nvidia 1070ti that work well with gpugrid (98% of use each).
i have just added a third identical gpu and the average usage of the three gpu has dropped between 60% and 80%, changing continuously.

the CPU is an intel G4400 3.3GHz (2 core at 100% non stop)

is there a limit in the number of gpu for gpugrid?
does the the power of the CPU is important ?

thank you

Matt Kowal
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Message 51723 - Posted: 24 Apr 2019 | 19:50:31 UTC - in response to Message 51722.

There is no GPU limit. Generally, it is recommended to provide 1x CPU core for each GPU.

Keith Myers
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Message 51724 - Posted: 24 Apr 2019 | 20:20:07 UTC - in response to Message 51723.

There is no GPU limit. Generally, it is recommended to provide 1x CPU core for each GPU.

Actually there IS a physical BOINC limit of 64 gpus max.

PappaLitto
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Message 51725 - Posted: 24 Apr 2019 | 20:49:15 UTC - in response to Message 51723.

There is no GPU limit. Generally, it is recommended to provide 1x CPU core for each GPU.

I would recommend putting the 3rd card in another PC if you can. I would say minimum of one core per GPU

philalux
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Message 51726 - Posted: 24 Apr 2019 | 21:09:59 UTC

well, thanks for the advice.

I see that the rule "one core per GPU" looks correct.

mmonnin
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Message 51727 - Posted: 24 Apr 2019 | 23:02:36 UTC

Thats the case if you're spinning. If not, 2 cores can handle several more GPUs. The card is easily fast enough to run 2x at once to achieve 95% util at 5-20% CPU per task.

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Message boards : Graphics cards (GPUs) : add a third gpu and the calculation dropped