Screwball mobo temps

[Traxan]

The hardware:

Thermaltake Typhoon case, 2 120mm fans, 1 80mm fan
XP 90 CPU with Sunon fan
3Ghz Northwood
Asus P4P800 mobo

Under a full load, I was getting CPU and mobo temps of around 116. So I decided to reverse the heat sink fan. It was blowing away from the heat sink. I turned it around to blow on the heat sink. The result?

113F CPU, 120F mobo. Both in Asus Probe and Asus BIOS.

WTF??? Mobo temp went UP?

 

[Traxan]

Reversed the fan again, so it's blowing away from the heat sink like before. CPU 116F, mobo 107F, under a full load.