   How do I make use of SLI?
  Hello, I'm about to get myself a new system and I'm wondering how much fun it would be to have two graphics cards. What are the interfaces to write SLI code in OpenGL? Can I just get one rendering context for each card and tell them to do different things? How do they communicate? Can I move say a texture from one card to the other without having to store it in main memory first? Would it for example be possible to upload the same geometry to both cards, tell one of them to render one view of the scene while the other is rendering another view and then send the finished picture from the slave card to the master card and show both on screen (just a stupid example)? Anyone got an answer or a good link describing the fundamentals of SLI?   
  Right now developers do not have control over SLI. The driver splits up the work onto the two GPUs, and texture memory is mirrored between the two cards. The best you can do is write SLI-friendly code. There's a chapter in The NVidia GPU programming guide about how to do that.I have heard rumors of more SLI functionality being opened up within the next several months, but I dunno if that's actually planned, or just wishful thinking.   ;  Ah okay. Then I guess I'm better of just getting one good card instead of two cheaper. That's a shame though. It would open up a lot of fun if you could let them do different things. Thanks.   