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http://www.firingsquad.com/hardware/ati_xpress_200_crossfire_performance/page5.asp

Looks like two X850XT in crossfire was all around beat by a single 7800GTX:

Even going with a best-case scenario where an XPRESS 200 CrossFire motherboard would cost you about $100, you’d still need to buy the second RADEON X800 XL card for another $300, setting you back $400 total. As an alternative, for $400 you could instead invest in a GeForce 7800 GT, which would give good performance, plus the ability to play at widescreen and super hi-res resolutions such as 2048x1536.

That’s right, the rumors you’ve been hearing about CrossFire being limited to 1600x1200 max resolution at a headache-inducing 60Hz are unfortunately true. How ATI’s engineers could have overlooked this limitation when developing CrossFire – a product which doesn’t really shine until you crank up the screen resolutions – is pretty baffling. To add insult to injury, we couldn’t get DOOM 3’s timedemo mode to work properly with CrossFire.

Similar results at Tech Report and HardOCP:
http://www.techreport.com/reviews/2005q3/ati-crossfire/index.x?pg=10
http://www.hardocp.com/article.html?art=ODE1LDc=
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