You can upgrade the GPU in that laptop, but apparently the 7800 is out of the question. The form factors are competely different. It's not just the chip, it's all the other stuff around the chip as well, just like you couldn't take the gpu chip off a regular videocard, plop it into a different one, and have it work. And as for cooling, your laptop would just melt. The heat put out by those 7800go's is just intense, and there's no way an e1505 could keep up.