I have a question, what's the diference between this two, going to the performance, because I have a friend with a laptop and 260m and I have my destcop with 260gtx, is it the same in performance, or mine is a little better???
The 260m does not in any way resemble the GT260. In fact, it's not even a GT200 chip - it's a modified 9800 series. The GT200 series were too power-hungry to fit in notebooks. The notebook 260 doesn't stand up to the performance of it's desktop brother that bears its name.
^pretty much what frozen said. I would just like to add the the GTX 260m in the laptop will perform similarly to a desktop 9800GTX. So it will be a decent card, just not quite as good as the one in your desktop.