M4A79XTD Evo asus unlocking 555 BE

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.
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More about m4a79xtd asus unlocking
    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

    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.
  2. 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.
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