There is a guy on forum.notebookreview that bought a 280m from rjtech and succesfully got it too work inside his m15x. His 3dmark06 score hit a good high 11k. Still not beating an m17 but that's damn good for a 15 incher.
lol he is tryingto say the x9100 will overheat when in fact it runs cooler than my old p7 series. if your budget is low, an x9100 is the best cpu just make sure you get an oem or step eo revision. of you can find $450 than grab a t9900...
There are oem x9100s for $350 dude man.
And Revision E0 is the final step/Same as the oem chip. No changes have been made from E0 step to oem.
The step E0 x9100 is $310 and that is the one I bought.
OEM copy is $350.
t9900 and x9100 are the same cpus. intel stopped the extreme line and relabeled the x9100 as t9900 and lowered the wattage. x9100 is 350 on ebay. Mine idles at 30c and on heavy load I get 50-60c. thats overclocked also