Because the Phenom X4 is a native quad core (unlike C2Q), when one comes out the fab and just a single core is bad, or can't clock as high, it has to go in the bin. Phenom X3 is just a way of saving money and not having to chuck that processor away.
Phenom X3s are Phenom X4s with one bad core.
so would this mean a whole new line of Mobo's would have to come out just to support the X3's or maybe BIOS updates would do the trick. cuz i want one now
Current mobos that support the Phenoms will support the tri-cores too.