Hi Leon and thanks for responding.
I understand that that there are risks involved with GPU switching and that as an end user, everything falls back to you.
I do it on my own risk and I know the dangers that lurk, although the K4000M is 100% safe thermal wise due to the fact its a 960 shader vs the 1344 shader 680M thats shipped with this notebook. Same goes for power requirements, it draw less power than 680M.
I know a guy who tried the 7970M on the GT70 but the BIOS wouldn`t recognize it. Drivers and everything was easy to install but the system just wouldn`t recognize te GPU. He said it was because of a whitelist. But since you say that there doesn`t exist any whitelist (100% shure?), my best bet is because its an AMD card and that it doesn`t support Optimus which is hardcoded in to the BIOS, hence the system wouldn`t let it pass? I`m not fully certain that he tried it with the newest BIOS from you guys though.
K4000M is a totally different story though since its Nvidia card plus it support Optimus just like GTX 680M. Right?
You say its a 50/50 chance it will work, what is the reason why it won`t work? Other than thermals?
Thanks again for your help
EDIT: Ah, after reading it again, I think I know what you meant. The obstacle you are talking about is the heatsink that many times doesn`t fit the MXM card. Well I`m positive it does since the K4000M is the exact same size as Clevo 680M, and I know a guy who said the GT70 heat sink matched perfectly to his Clevo 680M.