hell yeah, THQ is sweet. I'm still kicking the Dawn of War game, love it.
about the 6300, I can only draw a parralel between 9300 and E1705/M1710:
cards from 9300 worked in M1710 (7800gtx, 6800) bios rekognized them nicely, but when you try to put 7900 series into 9300 it was a no go, phisicaly and bios wouldn't rekognize them...
so my conclusion is that Dell will stick to their recipe. Flashing the bios from M1710 probably wont work, but try it anyway!
Only the modification to M1710 bios itself would allow it to accept 3600M. Just my two cents