Since the 5790 uses a MXM-IV graphics module and the 5760 does not you wont be able to swap it out with the Quadro 2500 unless you can find a MXM-IV Quadro and as far as I know the don't make them yet
http://www.clevo.com.tw/products/M570U.asp You can check out Clevo's website, according to them the 570U which is a 5760, can be upgraded to 4gb. Clevo makes the laptops and sells them to sager who add everything but the motherboard. So...