So I want to upgrade my trashy AMD Athlon II x4 640, and my mother board (M2N68-LA) says that these are the only upgrades available:
AMD Phenom II X4 9xx/9xxe/8xx Quad-Core (Deneb)
AMD Phenom II X3 7xx/7xxe Triple-Core (Heka)
AMD Phenom II X2 5xx (Callisto)
AMD II Athlon X4...