i have an asus crosshairII and i run speedfan to make sure my temps all stay under 45c but speedfan is saying fan5 temp3 is 55c idle and 100c while gaming but for the life of me i cant find what sensor it is. i just started to get blue screen of death 2 or 3 hours into gaming but its not the cpu bec it running 43c-45c gaming for hours. now my top gpu it hitting 70c when it never went higher then 55c. air flow is near perfect and i have the opt. fan for the antec 1200 on the gpu and an antec spot fan on the top gpu. anyone have any ideas? is the fan5 temp3 a sensor just a mobo sensor??? also it say the rpms are at 0 for that fan.