Fiery, thank you for your reply and suggestion.. I found the problem. I had a 3Ware 9690SA 8i raid controlley card in the bottom Pci slot. I removed it and PCH temps are 160-168F
pch temperature on msi mpg carbon wifi is 176 -190F. Is this normal? if not, how do i correct it? BTW, cpu temp is 100F. Case is clear and airflow excellent.