M4A79XTD Evo asus unlocking 555 BE

[Deveak]

I am trying to unlock a Dual core Phenom X2 555 BE cpu in a Asus M4A79XTD evo motherboard. I have a single HD 6850, 4 gigs of ddr3 and one hard drive 7200 rpm. I have a modular 550 watt psu an antec. I am using the latest bios update, 2102. It starts up fine i can browse and everything but every time i put it under load it shuts off. Any idea what type of voltage or anything like that I can change? Also the update changed the unlocking tool, i can no longer pick if i want 4 cores or a variety of 3 cores, but i can turn off cores individually, it says i have 6 cores though. It does show up as 4 cores unlock under the menu on windows index.

 

[Deveak]

"---MANDATORY INFORMATION---
Processor: Phenom II 555 BE
Unlock pass or fail: PASS X4 @ 4.2Ghz
Motherboard: Asus M4A79XTD EVO
CPU Cooler: Sunbeam Core Contact 120mm
Voltage: 1.52v @ 4200Mhz, 55c load | 1.48 @ 4050Mhz 51c load

---ADDITIONAL INFORMATION---
CPU Stepping: CACDC AC 1048
BIOS Version: 2102 (7/30/10)
Stability test application(s) used: Prime95
Amount of time passed in stability app: Hours
Any other pertinent info:
Power Supply- OCZ StealthXStream II 600w
Ram- Crucial Ballistix Tracer DDR3 1600 oc'd to 1816 (8,8,8,24) @ 1.72v
HT @ 2043
NB @ 2725
Multi @ 18.5
Bus @ 227
I'm sure I could get more out of it but 55c is my stopping point. Infact I may drop it back down to 4050 @ 1.48"

I found this on a forum about over clocking, same motherboard and cpu and bios, not sure what it means for me. Could be a bad core.

 

[cmi86]

Not all chips will unlock stably, most are binned down for good reason. Set everything back to stock (Multi's/voltages/timings etc...) Try unlocking again.