Hi, I have a Phenom II x2 560 Processor which can unlock to a Phenom B60 x4 cores using my friends motherboard(Asrock) for testing. Now I bought the Mainboard MSI 760GM-P23 from a retail store yesterday and today I assembled the whole system. After I installed the OS Windows 7, Drivers and etc.. I restarted my PC and went to BIOS settings Cell Function. I enabled Core Unlocker to Manual and what I can only see was there were only (2) cores Core 1 and Core 2 which made me worry because yesterday it can unlock to a Phenom B60 which is a Quad Core.. And I think I can't return the motherboard to the retailer even If i say that it can't unlock my processor..
I updated my BIOS and it still wont detect the 3rd and 4th core..
Problem is most likely that the board is a low end board with 95watt tdp limit. Your x2 560 is already 80W without the two extra cores. Unlocking two extra cores it would exceed 95W and possibly damage your board which thermal and power design is not able to deal with high power CPU's under load.