Generally, no. Very few laptops have "MXM" slots that can hold different graphics cards. For instance, my laptop, a toshiba qosmio x775-q7272, has a 560m. But, that 560m is in an MXM 3.0b slot, which can be upgraded to a 570m. However, people have done it with an i5 version of the laptop and on stock clocks it was 90-100C. Mine has an i7. Given, laptop graphics cards can withstand more temperatures, but in the chance your laptop can be upgraded, I wouldn't recommend it.
Rambisco, 90 to 100 Celsius when it's idle ? That's very hot, in fact, close to unusable !