In laptops, the graphics card isn't usually a card that you can take out and replace. It's usually a computer chip that's soldered (that is, attached permanently) onto the motherboard. There are some laptops that use desktop parts, and therefore could be replaced or upgraded, but they are usually very niche brands and very expensive products. I think Dell is part of the "solder to motherboard" group. I think for awhile Dell was trying to experiment with an upgrade-able system for its laptops, but the experiment didn't last that long. If you can provide the model of the alienware laptop, we could give a more specific answer.

Read this for your options:

https://www.dell.com/community/Alienware-Gene...Gen-Graphics/td-p/5573165

but remember: if you update your video-card, the same cooling in the same laptop remains. So I seriously doubt if it'll run significantly faster, it'll heat up and then slow down, I think. Apart from the fact that getting the right card and mounting bracket 5 years after the question above may not be that simple.