The 720s fourth cores are all locked, many are locked because the fourth core does not function, which allows amd to sell the other three cores as a perfectly good processor. While it is possible to unlock the fourth core, the fourth core is not guaranteed to function, nor is it even guaranteed to unlock. I would got for the Phenom II 940 or wait a little bit for the Phenom II 945 (AM3, DDR3) or even the 990 (3.5ghz at stock!). Check out this list of upcoming phenom II's, if nothing else, its very interesting:
http://en.wikipedia.org/wiki/List_of...icroprocessors
Yes that is a good motherboard, pretty much any 790 chipset will oc very well with the phenom II's. If you are a getting a PhII, any 790gx or 790fx will do, unless it has horrible newegg ratings or something. Although i would reccomend biostar, as they come with an excellent overclocking tool in the bios.
http://en.wikipedia.org/wiki/List_of...icroprocessors
Yes that is a good motherboard, pretty much any 790 chipset will oc very well with the phenom II's. If you are a getting a PhII, any 790gx or 790fx will do, unless it has horrible newegg ratings or something. Although i would reccomend biostar, as they come with an excellent overclocking tool in the bios.