1. Power supply has nothing to do with SLI or Crossfire.
All it does is provide power.
2. Motherboards can run any ATi or Nvidia graphics card. You can run 1 4870x2 on an nvidia board and the opposite also applies.
I Highly suggest you read up on computers some more before you even consider buying this stuff.
The 900 is not a very great case to be honest...
the 4870x2 IS a better card. However you won't see it shine unless your gaming at resolutions higher than 1900x1200...
I know that is the case, but why do they go out there way to say tested for sli, tested for crossfire? I know it is just a 6pin (or/and) 8pin that powers these chips and you need to match or be over the watts that is required.
At on time mobo did determine what you had by the way of crossfire or sli. AS if your motherboard did not support it you would be **** out of luck. I have no idea if all mobo would be vise versa. Also I know everything is PCI-E that is shipping new, but I also want to make sure no problems occur once i start combining parts.
If I was a guru about this stuff, I wouldn't be asking about it, I would just do it.
I am not doing water cooling, so please suggest something else. I can read all about water cooling, understand it is better, I just don't feel comfortable with that. I am already wasting money, I never said I felt like really giving it away.
You misunderstand what I meant about SLI and Crossfire.
An SLI board will not support Crossfire (multiple ati cards) however you can run one ati card just fine. In this case you would have no problem running a 4870x2.
A Crossfire board will only run a multi card ATi setup but will run a single 9800gx2 just fine.
Crossfire and SLI only refer to multi card setups.
The whole SLI or Crossfire certification is just a marketing gimmic. They pay ATI/Nvidia big bucks so they can slap a logo on it. Thats all it means.
So long as you buy a decent power supply, Corsair, BFG, Seasonic, PC Power and Cooling. You'll be just fine and won't run into any problems.
Like I said before, go back and read some building guides.
What the s*** are you talking about? I never even mentioned water cooling?!?!
If your going to be this difficult to deal with I'll delete my posts and leave.