Yes, you probably want to upgrade the laptop.
When it comes to laptops, even seemingly compatible components won't always work as expected, due to certain issues such as BIOS support.
I know someomoone attempted to upgrade the Area-51 m17x laptop with GTX 260m cards on SLI. They had to swap the vbios, if I recall correctly. The cards did work, but the cooling fans wouldn't run. They had to settle for a single GTX 260m and a 8600m GT, if I recall properly, because that was the only way the fan for the GTX 260m would work (and permanently at max RPM)
There are better ways to make a fan work,lol.
You just connect the fan's power wire to a small controller. Might take some electrical knowledge but you should have some for that kind of mod anyway. Basically though, a gpu fan is just a fan and can be treated as such.