Tree, you always surprise me with your astounding amount of wisdom. NOT
A game does not have to coded to support SLI or Crossfire. It's like saying a game has to be coded to support headphones with an equalizer or bass boost instead of just regular ones.
Crossfire and SLI can be enabled just as they are - however, and this part may be tricky - there are issues preventing SLI from working properly out of the box.
One example is deferred shading that doesn't work well with AFR (read:
http://en.wikipedia.org/wiki/Scalabl...Implementation ), AFR is the default renderer method though.
So yes, nVidia needs to be talked to and that is the core reason why you see those shiny cool nVidia and ATi intros in some games - because the GPU vendors get involved with the gaming studios to optimize their drivers and in some cases the engine. Depending on how the engine works at it's core this may or may not work out perfectly.
Also, keep one thing in mind. Personally I see SLI as rubbish. It's utter crap and waste of performance but it is, sometimes, a way to fix performance bottlenecks.
However, don't expect it to always work. It's a feature that may or may not work - like CUDA, physX and other proprietary stuff.
First of all thank nVidia for being a... pick an insult of your choice, ... company and playing the game like a badass gangster by literally fighting patent wars and buying and keeping technology just to make sure no one else can implement it.
In an ideal world no one would buy this stuff in the first place until they get their act together. So stop harassing the devs - harass nVidia for being an incompetent company with more than questionable approaches - it's not maddox work to clean up their mess although some engine decisions might make it hard to implement it perfectly. But then again: perfection is impossible. You should know that perfectly.
