Finaly I did run Prime (Thx KTE 4 Link) on my system for 8 hours with this settings:

HTT=255
CPU=11x
NB=9x
HT-LINK=1.8ghz

vCore=1.465
CPU VDDA=2.8v
vNB=1.4v
vHTT=1.3v



The temps are lower ~10º bcz I had to take my son to school.