Hello. I don't like how my processor gets a high temperature and make a lot of noise with its fan. I have a good video card (radeon 5670 1GB) I know that GPU processing is a lot better than CPU processing. So I don't know how configuring BOINC MANAGER in order to only using my GPU, not my CPU.

It would be good because GPU processing does not affect your computer performance.

It's not a BOINC Manager setting, but a project preferences setting.
And only used for the GPU application that the project gives out by default.

E.g. Einstein project prefs will show:

Use CPU
Enforced by version 6.10+  yes/no
Use NVIDIA GPU
Enforced by version 6.10+  yes/no

This is because Einstein only has CUDA (Nvidia) applications.

On a project like Milkyway@Home it'll show:

Use CPU
Enforced by version 6.10+ yes/no
Use ATI GPU
Enforced by version 6.10+ yes/no
Use NVIDIA GPU
Enforced by version 6.10+ yes/no

But do know, that all GPU applications still use the CPU. There is no GPU application that runs completely on the GPU. You still need the CPU to translate the contents of the task to something the GPU can understand, plus to transport this translated data to the GPU's memory. Then when the GPU is done with the calculations, the CPU will transport that data back, translate it back to something the humans understand and write it to disk.

It then depends on how many tasks you run at the same time on the GPU to know how much load the CPU endures. But totally running without the CPU is impossible.

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Also note that primegrid uses openCL which means that it will use your cpu at ~100% plus the gpu

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