One interesting observation:

With the 660-only running, it consumed a whole CPU thread; 13% of the i7.

With the 460 running too, it uses a lot less:

You can't run more than 1 nVidia for POEM (and all other OpenCL projects, I think). To keep running some POEMs you'd need to exclude one GPU from this project, or mix AMDs and nVidias in one machine.

Edit: yes, the CPU usage again. For Keplers a whole thread is used, for older cards much less.

MrS

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Scanning for our furry friends since Jan 2002

You can't run more than 1 nVidia for POEM (and all other OpenCL projects, I think). To keep running some POEMs you'd need to exclude one GPU from this project, or mix AMDs and nVidias in one machine.

I wonder why I got two...

Edit: yes, the CPU usage again. For Keplers a whole thread is used, for older cards much less.

MrS

That would explain it. Thank you!

You can't run more than 1 nVidia for POEM (and all other OpenCL projects, I think). To keep running some POEMs you'd need to exclude one GPU from this project, or mix AMDs and nVidias in one machine.

I wonder why I got two...

Random chance. Not sure you understood correctly: any POEM WU assigned to your 2nd GPU will fail in the stock config.

MrS

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Scanning for our furry friends since Jan 2002

I know some of you will be cringing, with finger on fire department emergency button, but I had to do it...

The PCIe 1-16 riser, and the Molex PCIe power adapter, arrived. I connected the 660 to the Molex, and the two PSU PCIe connectors to the 460. Windows spent a long time installing S/W for the 460 but it appeared.

Well - if you were cringing you were right! Too many times the CPU temp went into the red zone, so I removed the riser, and its GTX 460. I'm now back to just the GTX 660, and all is well.

Question: was my problem the lack of power (610W for the two GPUs), or was it insufficient cooling?

If the CPU becomes too hot it's insufficient case cooling, assuming the CPU fan already works as hard as it can. Too hot is actually caused by too much being burned, so the PSU did its job just fine ;)

MrS

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Scanning for our furry friends since Jan 2002