Nope I can't see it in my bios, that was the first thing I did.
However, I did some more research and found out that I'm actually dealing with a mini PCI express card slot. Which means mSATA cards won't even work here.
I saw a tutorial about connecting an external gpu to a laptop using this slot. http://www.youtube.com/watch?v=ktUw2VTFyX4
So that's something I'm gonna look into.
Thank you all for the helpfull comments!