In a message dated 19/12/2007 17:09:36 GMT Standard Time, mike.brook@xxxxxxxxxxxxxx writes: My apologies! 'SLI' is an NVIDIA developed system which allows two of their advanced graphics cards to act in parallel as if they were one super-card. The technology is very much in its infancy but could be a way forward to improve 'game play' with the current processor and MoBo technology. I'm using a 'dual-card# system but expect to see 'quad-card' usage appearing soon. I just have a single 8800GTX card in my system, although the mobo can take 2. If they build them with space for 4 I'm going to need to get my floor re-inforced to take the weight! Frank T.