when i use zbrush and move my model around for seconds the cpu fan goes high and when i let the model go it goes down again !! is that normal ? cuz the fan sound is high it reach 2200 rpm and the load of the cores are 95-100% but the temperature is normal its fluctuating around 40-55c !! is that happening with anyone else ? is that normal for the fan to go up and down like that ?
my cpu is core i5 6400 4 cores 2.7ghz
never heard my fans kick on.
so that is not normal i guess ? 
Read about similar to it on here before, few months back. They might have been on a Mac though, I think they had to reduce the number of cores used…
reduce the number of cores ? but zbrsuh using all cores for better performance the software is intensively using the cpu!! how could that be a solution ? and beside they are only 4 cores !
It’s normal that cpu cooler and fan cooling processor , higher load - higher temp. - higher fan rpm. (Dont think those temps are real core temps)
As for speed and noise, you probably have stock cooler - cheapest aftermarket cooler should make big difference… This is not rely forum and theme about comp hardware.
And for question related to zbrush - even moving model is cpu task, how hard depends on model. Mesh resolution isn’t necessarily mayor problem, ‘bed’ meshes with lots of overlappings and similar stuff can be very hard even with low polycount.
You didn’t mention anything about your model…
Try some example meshes (tools) from lightbox (divide them if needed to some reasonable resolution) and see cpu utilizations.
That’s a Mac thing. So you are probably on a Mac?
the active point is 1.600 million poly count with no overlapping just some sub-tools for teeth and eyes and one big helmet the total point is 12 millions !! the cpu usage when i use zbrush like moving the model around it reach 100% the fan then gets high but if i sculpt on the model everything is normal no fan noise just normal the heat is no problem here and even i went to the bios and change the fan usage from normal to silent it worked and no noise but zbrush was crashing i think the cpu has been throttled
no why did u say that ?
Couple of things.
Rotating a mesh is the most intensive CPU operation in Zbrush.
- Do you have subD levels on your mesh? If you have lower subD levels that Zbrush can swap to during rotations it will do this, which lowers the CPU overhead.
- What are your performance settings at? See below for mine.
- Do you have Dynamic subD levels turned on as well? This will massively effect your performance if you have a dense mesh using dynamic subD levels. Always use standard subD levels for dense meshes.
A while back, Mac users were complaining that their fans were always revving up to full when using ZBrush.
thank you for your help