Wrong CPU temperature on P5K-EPU with Xeon 5460

Hi all,

Fisrt, sorry for my english...

I have modified the last bios for my motherboard Asus P5K-EPU (604) with MMTool to add microcode xeon 45nm, my Xeon 5460 works correctly but the temperatures recorded by the bios are incorrect : +15/20°C more than reality, my fans turn too fast and my pc makes a plane noise...

I searched the forum and I have try with MMTool, AMIBCP and RWEverything to corrected that but despite my many research I can't find a way to correct this.

Original Bios :
  P5K-EPU-0604.ROM (Size: 1 MB / Downloads: 0)

Bios 604 modified with MMTool (without AHCI) :
  P5K-EPU-0604-XEON-45NM.rom (Size: 1 MB / Downloads: 0)

Intel X5460 SLANP specifications : http://www.cpu-world.com/sspec/SL/SLANP.html

My question: how to fix that ?

Thanks for your help