What's great about the HD 4850 isn't just the fact that it offers excellent value for money in Crossfire, but also that the performance you get is the difference between playing games at 1920 x 1200 and not. While the HD 4850 on its lonesome is probably best for gaming at up to about 1680 x 1050, if you really want to up the ante and get some 1920 x 1200 or 2560 x 1600 gaming in, going Crossfire is definitely the right thing to do.
What AMD has on its side is the fact that Intel boards are Crossfire compatible, and what enthusiast doesn't have an Intel CPU with a supporting Intel chipset? - While the 700i series of chipsets from NVIDIA are popular, they have nowhere near the market share of Intel. Thanks to the price and the ease of setup, anyone can really get on the Crossfire wagon. And if you find yourself with a system as powerful as the one we've got here today from IBuyPower Australia, that's when the cards will really begin to shine.
It looks like NVIDIA really has some competition this time around, and as long as enthusiasts around the world get excited about the new HD 4k series, AMD could really begin to pick up some market share.