Hello TRuEQ and TuVaLu,
I do not think that is possible. We are not running a regular GPU project yet. We do not have much GPU control logic enabled yet. There has been a little discussion of enabling a lot of GPU control logic if we ever get a GPU project running. But right now there is very little ability to control GPUs.

Lawrence

The only current config option in the device profiles "If my computer can process work on my graphics card, then please send me work to run on my graphics card for the projects that I have selected above. work", works so that if you select at least HCC and Beta testing for same profile (separate page), you'll be getting the HCC Beta's, if available, and you're online to force the updates to fetch them (they run out fast). Help Cure Cancer is a "light" to crunch program on CPU, and besides BOINC can be configured to run only when you're doing nothing, or use the TweakMasterGUI tool (see Start Here FAQs), to set the use to for instance 50% (My laptop is set to 80% for heat control reasons on the warmer days). Whilst BOINC is designed to always back away when you need the computer (it runs in lowest priority), TMG allows to give you the instant headroom when configging BOINC to run even whilst you're using the computer. It's barely ever noticed to run.

Notably, running GPU crunching whilst using the computer is more likely to be "experienced" (those with powerful GPU cards/machines don't). The default of BOINC to run these only when the system is idle, same as the CPU part of BOINC.

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edit: Quote in italics

It also depends on how WCG sets it up, some projects tend to use lots of cpu power in addition to the gpu but that is mostly Nvidia cards. You have AMD card and MOST of my cards run at 0.01 to 0.05% of a cpu to keep the gpu running at full power. There ARE exceptions to the rule of thumb of course, but it MAY work out okay since you have an AMD card. Also normally a gpu does not need more than one cpu core to keep it running at full power, after the gpu is the one working hard, the cpu is just taking the finished work and giving the gpu new work. I have a 5770 AND a 5870 in an older dual core pc and the cpu's are only being used at about 65% of their available power to keep BOTH gpu's cranking!! The problem is that the cpu's are older and VERY inefficient!! In short the answer is....try it and see how it goes, no one knows for sure yet.