It appears, from the little I've observed, that my ATI Radeon 6950 does less crunching when there is no monitor attached to it, does that make sense? Must admit, it doesn't to me ;-)

P.

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It appears, from the little I've observed, that my ATI Radeon 6950 does less crunching when there is no monitor attached to it, does that make sense? Must admit, it doesn't to me ;-)

P.

If the monitor goes to sleep, from the Windows power save settings, the GPU slows down to its lower clock rates. With a "no monitor" condition I would expect the same behavior.
If a monitor is connect but powered off this does not happen.

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It appears, from the little I've observed, that my ATI Radeon 6950 does less crunching when there is no monitor attached to it, does that make sense? Must admit, it doesn't to me ;-)

P.

If the monitor goes to sleep, from the Windows power save settings, the GPU slows down to its lower clock rates. With a "no monitor" condition I would expect the same behavior.
If a monitor is connect but powered off this does not happen.

Once again I thank you ;-)

P.

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Weird, I would be surprised to see any influence on the GPU clocks of a loaded GPU (i.e. by BOINC).

So far I never noted any difference even in non-monitor equipped multi-GPU setups under 24/7 load with BOINC.

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Weird, I would be surprised to see any influence on the GPU clocks of a loaded GPU (i.e. by BOINC).

So far I never noted any difference even in non-monitor equipped multi-GPU setups under 24/7 load with BOINC.

Well, in my case, the number of wu's processed by the card definitely dropped, from around 90 a day to 50 a day, for the 2 days, which meant my RAC also dropped.
;-( One other weird thing happened as well, I switched the monitor to the onboard Intel gpu, which Boinc then "saw" and promptly gave me another 100 wu's. Now I've switched back to the Radeon, the iGPU isn't seen by Boinc any more.

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Weird, I would be surprised to see any influence on the GPU clocks of a loaded GPU (i.e. by BOINC).

So far I never noted any difference even in non-monitor equipped multi-GPU setups under 24/7 load with BOINC.

Well, in my case, the number of wu's processed by the card definitely dropped, from around 90 a day to 50 a day, for the 2 days, which meant my RAC also dropped.
;-( One other weird thing happened as well, I switched the monitor to the onboard Intel gpu, which Boinc then "saw" and promptly gave me another 100 wu's. Now I've switched back to the Radeon, the iGPU isn't seen by Boinc any more.

If you want BOINC to "see" the iGPU all the time here is a way to do it.
http://www.hal6000.com/seti/manual_display_detect.htm

Once this has been set & BOINC sees the iGPU you can then change the display settings back to non extended. The iGPU still be seen until you restart BOINC.

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Well I'll be damned....

HAL9000 is absolutely right.

I just ran GPU-Z logging during the period of having the monitor shutdown (HD7970 on Win7).

The result :
GPU load consistently dropped from 99% to 87% despite still running 2 GPU tasks.

PS.
So far I thought the only source of significant loss of crunch performance came from forgetting that BOINC by default also installs and sets its screensaver, sucking performance while running (if one forgot about that detail after installing it).

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PS.
So far I thought the only source of significant loss of crunch performance came from forgetting that BOINC by default also installs and sets its screensaver, sucking performance while running (if one forgot about that detail after installing it).

And if one forgot to deselect the screensaver option during installation.

Well I'll be damned....

HAL9000 is absolutely right.

I just ran GPU-Z logging during the period of having the monitor shutdown (HD7970 on Win7).

The result :
GPU load consistently dropped from 99% to 87% despite still running 2 GPU tasks.

PS.
So far I thought the only source of significant loss of crunch performance came from forgetting that BOINC by default also installs and sets its screensaver, sucking performance while running (if one forgot about that detail after installing it).

On my notebook the GPU clock drops from 750MHz to 150MHz. The GPU load stays about the same for me, but processing is slowed to 20% of normal speed.

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On my setup (HD7970), the GPU and VRAM clocks weren't reduced - but the GPU utilization dropped some ~12% plus some VRAM was being freed (while 2 GPU tasks running).

Hard to tell how much performace got lost that way but I can imagine it must have been a chunk.

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