AMD's most recent 45nm Athlon II processor just graduated from dual, to quad core. The AMD Athlon II X4 620 is a 2.6 GHz socket AM3 chip destined for mainstream PCs; could it be the darling CPU option for those on a budget? One thing's for certain, there couldn't be a better chip to land in the midst of global belt-tightening, especially as the quad-core Athlon II X4 620 retails for just $99 bucks.