Finally had time to OC...
2.9Ghz passed first 20 min stability test (Everest), but failed second 1h test (idle ) on firefox start

Now happy at 2.8Ghz.
This is my stepping: JAAFB AA 0810 GPBW

Reduced voltage from 1.3 to 1.275 (in bios) and seems to work the same.

However, Everest shows the voltage is 1.25, although for 1.3 it was showing 1.3
Anyone observed similar voltage problems?
Is my voltage 1.275 or 1.25 ?
Is reporting wrong or voltage dropped more than specified in bios?