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Can this motherboard unlock my AMD phenom II x4 960T to a x6 processor

If the cpu unlocks YES
EC AOD-ACC SUPPORT
EC AOD-ACC is described as Embedded Controller for AMD OverDrive- Advanced Clock Calibration which is destined for the specified AMD CPU to overclock/unclock the core further than previously possible through BIOS settings.
 
http://hardforum.com/archive/index.php/t-1499697.html

Read this. ACC to auto, select Hybrid firmware etc.

And yes, it can cause I was running a 960T unlocked in one. Only problem is they only really support 95W CPU, the unlocked overclocked 960 (1600) sucks down 150W+.

I killed it by OC to 6x core @ 3.9 and prime 95 for 10 minutes. Make sure you have a damn good PSU - 600W+

Upgraded to a GA970a-D3, better power delivery, USB 3.0 etc. Much more stable.

Do not put a high end 6x AMD CPU into an entry level Mobo. Take it from my experience, you'll end up regretting it.

Edit: to confirm the previous users input:
http://techwiki.hardwarecanucks.com/product/0NzEyNzM2MzE3NTE1/Gigabyte-GA-MA78LMT-S2/
It does support ACC.