No....not unless you want to end up with a non working lappy...
All the best Brett
Have you screwed up a laptop upgrade? I've done several upgrades to my laptops and some friend's laptops without any problems. I've upgraded RAM, CPUs, and hard drives. Graphics can sometimes be upgraded. High-end graphics is more likely to be upgrade-able since high end graphics is more likely to not be integrated into the motherboard or CPU.
Alienware laptops probably all have discrete graphics cards so upgrading is possible so long as the laptop doesn't already have it's best possible configuration.