Hi

I have Proobook 4740s with strange problem. After few minutes of normal working it starts to work very slow.Slow like cpu is throttling.
It works ok just about until it gets working temperatures...There is no shutdown or anything abnormal just slow work...Temps are ok...

Steps i have done:
-installed new and different hdd,ssd`s and os`s same problem ,so this is definitely not software or hdd problem
-updated bios to the latest version
-reprogrammed with clear me region
-replaced cpu
-turned off amd discreete gpu in bios,so that laptop works only on intel

No difference at all...
Any idea?

any idea ???

Replace PCH..