The maximum safe voltage for this processor is 1.425v according to AMD. You guys are going off the stock voltage setting for a dual-core not a quad-core. The 965 (for example) is about the same rating stock (1.4 volts) hence the reason why I recommended trying 1.4 volts. Unlocking additional cores may require more voltage. My Athlon II X4 620 is stock at 1.4 volts. Trust me I've tried undervolting the processor but it failed miserably in OCCT in the first 20 seconds of testing. Granted the 620 runs cooler because of it's smaller die size but it's still a quad and requires that amount of voltage regardless. Also the cooler that came with my 620 is identical to what is used on the 550
It's worth a trying. Heck for all we know TheM could be trying to unlock faulty cores...
the reason i do not think it is faulty cores is because prime 95 ran 3-4 hours with core 1 3 and 4 fully stable, and another time, core 3 failed, and 2 went for an hour (till i closed prime), so i feel that i am only giving enough volts to power 3 cores maybe? rep+