How can I get such low FPS with this laptop?

My laptop: Dell Alienware 17x

TechSpecs:
TechSpecs.png

I can play every other game with almost max graphic setting (Black Ops 2, Battlefield 3, Sleeping Dogs...)

But on CrossFire I only get about 80 FPS, and it spikes very often :|
In some maps like Submarine Assault or Spain it drops to 40 :|

I used to have 200 FPS, but after some latest patches (not sure which one), it became worse...

PS: I'm running on Windows 8 Pro

Anyone knows why?

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