Dell M4500 and Dell M6500 MXM GPU help

[Slingshot488]

So, I've been looking at the Precision line of Dell laptops. Specifically, the M4500 and M6500.Both of these laptops have MXM GPUs.

I was wondering... If both GPUs are of the same voltage draw, would I be able to put the more powerful one from the M6500 into an M4500, and give myself the benefit of the 14 inch screen?

Pls respond.

The GPUs are Nvidia FX 2800M, and FX 1800M, respectively.

 

[Slingshot488]

The question also applies to all MXM-format GPUs, of course.