lostcircuits.com: The Phenom X3 II 720 is being sold as Black Edition, meaning that the multiplier is completely unlocked, in short, an invitation for overclocking. In fact, as it turned out, I have never seen a CPU that easy to overclock out of the box without doing anything beyond moving a few sliders on AMDs OverDrive utiliy.
techgage.com: Phenom II may have just launched last month, but AMD didn't want to waste time in following-up with their first AM3-based processors. We're taking a look at two, including the X4 810 and X3 720 'Black Edition'. Both offer great performance at their respective price-points, but the X3 became the more appealing chip, thanks to its overclocking ability.
ocia.net: With the launch of Deneb, AMD has finally moved to the 45nm process and are breaking in a new socket interface at the same time. The main difference with AM3 is the introduction of DDR3 support. But rather than require a forklift upgrade, AMD has incorporated both DDR2 and DDR3 memory controllers into the AM3 chips.
/proc/cpuinfo output for one AMD Phenom II X4 20 core.