Thanks for the replay but i have two other questions one is will that be ok with my current cooling or will it over heat and my second question is that is about the price of the m290x would i be able to do that.

also would a http://www.ebay.com/itm/For-Dell-Alienware-M17X-R3-M18X-R1-MXM-3-0-Radeon-HD-6990M-2GB-Video-Card-RDRGR-/301229192835?pt=PCC_Video_TV_Cards&hash=item4622a8b683 

or 

http://www.ebay.com/itm/For-Dell-Alienware-M17x-R3-M6600-AMD-HD-6970M-2GB-M8900-Games-Video-Card-6W46K-/231255881272?pt=PCC_Video_TV_Cards&hash=item35d7ecb638

Work?

It's possible, but the cards are not inexpensive.

http://www.ebay.com/itm/Promotion-Alienware-AMD-HD-DELL-7970M-2GB-GDDR5-for-M15x-M17x-M18x-upgrade-/261275711150?pt=PCC_Video_TV_Cards&hash=item3cd53ef6ae

I don't think the m290x was ever offered in this model - bear in mind that the BIOS has to support whatever card you install, so it must be one that Dell shipped for this model.  Even if the card physically fits the system, it won't work unless the BIOS recognizes it.

Thanks but the 460m is still very slow i guess i will just try and figure out how to get a 6990m in there.