I have a Phenom II X2 550 3.1 and an Athlon II X3 435 2.9 still in the box and want to try unlocking one. Obviously the Phenom would be best as it has L3 but I won't know until I try if either chip will run stable w/4 cores. Some older mobo's that will unlock these, if the bios is right, can't be found.

Can anyone recommend boards that have that ACC option so I can try to unlock, and where to source them? I also will be trying to OC in the future so if any boards are better for that I'd appreciate any info anyone may care to give.