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2 card V 1 card

You do two cards instead of one in two cases:

1. When two low-end cards together cost less but perform better than a single high-end card. This doesn't happen as often as you would like. For example, today on newegg, two 5770 1GB cards cost $160 each for a total of $320, and run about 10 percent faster than a single 5850, which today costs $285 for the weekend deal and $305 otherwise. In this case I'd rather have the single 5850, because if for some reason it wasn't enough, I could get another 5850 later.

2. When one high-end card doesn't have enough performance. Example: you're running something insane like 7680x1600 and one 5870 isn't enough for you so you get another.

Today for a single $300 card, the XFX 5850 1GB is on weekend sale for $285 versus several models of the GTX 470 for $330. The 5850 at $285 is a great deal, so good you could seriously consider going a bit over your budget and getting two. The 5870 is $390 and the GTX 480 is $480, making it hard to recommend either of them versus the 5850.
 
Maybe if you go Nvidia. Haven't used SLI since the 8800s. I've had 3870, 4850, and 5770 crossfire setups though. It sucks. ATI drivers are problematic enough with one card. Throw in another and it's a mess. When it works, it works great. When it doesn't work, it's a nightmare.
 
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