i building a gamer i want to cross fire 2 of SAPPHIRE 100245HDMI Radeon HD 4850 here is the link http://bit.ly/9HdSW1 with 2 of the SAPPHIRE 100270SR Radeon HD 4850 X2 2GBXFX here is the link for this 1 http://bit.ly/cEljJ7 on the msi gd70 is it possible