for those who use R9 7845HX(I'm using laptop, not sure whether it's the same with desktop), here should be your perfect setting:
[threads]
computeColliders=6
skinmeshPart=6
skinmeshPartMaxPerChar=6
applyMorphs=6
applyMorphMaxPerChar=6
#affinity=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16...