I have two GTX 570s, but one of them gets much hotter than the other. I would like to prevent BOINC from using GPU0 for any projects. I am currently using BOINC Manager 7.0.18 x64, and I have added

"<ignore_cuda_dev>0</ignore_cuda_dev>" and "<ignore_nvidia_dev>0</ignore_nvidia_dev>"

tags to cc_config.xml. Unfortunately, even if I do Advanced -> Read config file in BOINC Manager, it does not prevent the use of either GPU. Am I missing something?

You have to exit BOINC & restart it to have this option work. GPU decisions are at present only made at BOINC start-up. Ignoring a GPU is such a decision.
See How to exit BOINC completely? for info on that.

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Okay, I exited completely and restarted. It's working now. Seems like a pretty obvious thing to have tried *facepalm*

One more related question- the GPU is running at ~50% on einstein@home (don't know about other projects). Is there a way to get it to use 100%? I've tried upping the priority in task manager, but it only goes up 2-5%

You'd have to add an anonymous platform (app_info.xml) file that says you want to run more than one task on that GPU. But for that you better look in, or ask on, the Einstein forums. Start by checking all those threads asking about app_info.xml files in http://einstein.phys.uwm.edu/forum_forum.php?id=3. And if still confused, just ask there. ;-)

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