There's a Vista issue where the second core is unavailable to do CUDA work, hence the errors. There are suggested reg fixes and other tricks such as dummy monitor connectors that can possibly fix it. Though they didn't work in my case.

That explains why the second core I think I have isn't used, then. Thanks for the information.

There's a Vista issue where the second core is unavailable to do CUDA work, hence the errors. There are suggested reg fixes and other tricks such as dummy monitor connectors that can possibly fix it. Though they didn't work in my case.

That explains why the second core I think I have isn't used, then. Thanks for the information.

There is also the "fix" in 6 BOINC 6.6.24 where the minor memory delta on the second core renders it unusable, 6.6.25 has a cc_config setting to force use of all GPUs (which I am using with my GTX295 pair and have 4 turning and burning as I would expect).

So there are more than one reason for a GPU to be unused.