Here is how my projects screen looks right now: http://prntscr.com/eud1xr

The M@H task is only supposed to use 0.608 of a CPU, right? However, the percentages for the Citizen Science Grid tasks won't budge at all until the M@H project finishes, at which point they progress a little bit and freeze again when M@H starts a new task.

All my four cores (I have hyperthreading, thus the 8 tasks) are always working at 100% throughout. I'm worried, thus, that this effort is being wasted! What's going on?

I have a GTX 970 and a core i7 3750 with BOINC Manager v 7.6.33 (x64) on Windows 7.

Thank you!

P.S: I also posted this on the M@H forums, but I have had no replies so far.

The M@H task is only supposed to use 0.608 of a CPU, right?

Well, that value isn't set in stone, it's an advisory value. A minimum so to say.
Just about all OpenCL applications do like it to have a whole CPU core free for themselves, so rule of thumb is to free one CPU core per GPU.

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so rule of thumb is to free one CPU core per GPU.

How do I go about doing that?

Set "Use at most N% of CPUs" to 99% or another value that would set your CPU to use all but one core. The value is an integer.
E.g. on a quad core (4) that's 75%-99%, leaving 3 cores to run work. On an octo core (8) that's 88%-99%, leaving 7 cores to do work.

All cores = 100%
Use at most = 100% divided by (all cores minus one) rounded up or down to the nearest whole figure.

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Set "Use at most N% of CPUs" to 99% or another value that would set your CPU to use all but one core. The value is an integer.
E.g. on a quad core (4) that's 75%-99%, leaving 3 cores to run work. On an octo core (8) that's 88%-99%, leaving 7 cores to do work.

All cores = 100%
Use at most = 100% divided by (all cores minus one) rounded up or down to the nearest whole figure.

I see, thanks. But since it governs the use of CPUs by the application, and the GPU tasks are part of the same application, will the freed-up core actually be used by the BOINC GPU tasks?