is it possible to replace a 2009 unibody with the new 320M graphic?

Hi, I have a 13" macbook that was the first generation of unibody macbooks, it coes with the 9400 graphic chip. is it possible to replace it with the newer 320M chip? since my other specs match closely to the recently released mbps, it seems silly to dish out 1.5k to get a new one... thanks for the help!

sry if this topic has been discussed before.

No the 320 takes a different motherboard and has its own memory unlike the 9400 with
shared memory and also it would require a second fan for cooling the 320.