ok so my 9800 gt. on one of my dvi ports am getting a purple screen. the other is ok. so one port is gone what i am thinking is do buy another 9800 gt use that as main plug in for monitor and tv and then sli up to this 9800gt will this work and will it make things better for gaming or do i buy somthink like this .... http://www.overclockers.co.uk/showproduct.php?prodid=GX-069-GI