I have a Asus M5A99FX Pro R2.0 mobo with a AMD FX-8320 CPU OC'd at 4.6 GHz and a pair of Radeon HD 7850 running in Crossfire. Ambient temperature around here is about 26C, but during idle, the southbridge heatsink is around 40C. I could put my finger on it for awhile, but not long. During...