Heh,
So... 4830's in Crossfire (two cards, cheapest on NewEgg right now $119 each, or $99 with rebate, puts it at $240 for that setup for the cards, or $200 with rebates assuming you get two rebates, I gather, you'd get one due to limitations, so more like $220 right now). I would hope that any modern 48** series in Crossfire at HIGH resolution with AA enabled would actually perform on par with a single powerful 260 at the same settings.
@OP, read those charts, it's not on par with a single 280. It's on par with a single 260. And a single 260 costs $230 with rebates at NewEgg right now. The same cost as both those 4830's in crossfire.
This is by no means warrant to say "budget card on par with..." anything. You're spending over $200 for these "budget" cards and for that, you might as well have gotten a single 260 which you can SLI later when prices come down even more and totally blast away this `budget' build while spending about the same and not being stuck with TWO cards that are budget; instead, get ONE card that is not budget that will be even more powerful later with a 2nd added, instead of a `total upgrade' which would be required in the 4830's case when the time came.
Notice they didn't show benchmarks of XF/SLI HD4850 ($130 at NewEgg.... why on earth would you buy a 4830 when the 4850 is only $30 more after rebate). They didn't show some 9800gt's in SLI either ($99 each at TigerDirect; cheaper, and I bet they do very well compared to those 4830's).
... Stop trying to sell 4830's. There's better cards in the price range. And with how prices are, no reason to get 4830 when the 4850 is so close to it in cost per card, and the 9800gt so close per card in cost. If you want to get two cheap cards and XF/SLI them, don't, get a really good single card, like the 260, which is the same cost as those crossfired budget cards together, which won't be gimped when it's time to upgrade as you can add another 260 later as prices come down when you need the performance boon.
Buying two 4830's when a single 260 costs the same, and both have equal performance, is retarded.
Very best,