I am using 4 CPU's , they all work 100% when rendering mesh, but only if I use "CPUControl", a little free tool.
Will test more soon.
I thought there was a way to use a third pic, but don't get how yet?
hmm. well, you shouldn't need an external software. Go to Menu/sculpt/options/Number of sculpting thread.
what do you read?
change it to 4 thread and click ok.
your next sculpt should show 100% usage of all 4 cpus.
How fast is it by the way?
The 3rd image is opened in menu/?/laboratory/open left image to improve sculpting
The left image is not displayed in the interface at this time