Thanks to Franck@X86 for his help, he had help me to find how to manage the multiplier :

Quote Originally Posted by Franck@x86
Si tu veux hanger librement le coeff :
- utilise un éditeur MSR (comme celui de crystal)
- édite le MSR 0x1A0
- mets le bit 16 Ã:banana: 1 (EIST on) et le bit 25 Ã:banana: 0 (C1E off), soit dans eax : 0x61850089

Dans le power options de Windows, mets toi en mode desktop / toujours actif.

A partir de lÃ:banana: le changement de coeff de crystal va fonctionner.
approximately translated :

-use an MSR Editor same as CrystalCPUID
-Edit the MSR : 0x000001a0
-Set the bit 16 to 1 -> 0x61850089

into the power management of windows set always on

then have fun !!!