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.
Small improvements? It depends on the difference between the previous CPU/GPU and the new ones. Sure, going from a 6900m to a 6990m won't give a good difference, but going from 6700 to 6800 or 6800 to 6900 cards will be a greater difference.
Also, the better CPU/GPU don't need to be expensive, just go to ebay.
It has a 2.1 GHz Core 2 Duo and a GeForce 6800m. I also have someone who can perform the upgrade for me. Can anyone tell me what I should buy to upgrade to? I know it isn't the beat configuration because he bought either the cheapest or second cheapest he could.
You can try Google to find out all supported CPUs, graphics cards, and RAM configurations. You can definitely get a better CPU and video card, but I don't know if a laptop that old would support the newest video cards. However, it can almost certainly support faster graphics than a Geforce 6800m.