Originally posted by: Pete
Chumbo sells two BFG 6800GTs and a 530W BFG PSU for about $850. They also offer a single BFG 6800GT for $400. Dunno if they ship to Canada. They're also both "Highly Allocated," which appears to be code for "Get in Line, Buddy."
That's compared to PriceGrabber's best prices of $505 for a X850XT or $600 for a X850XTPE. Actually, Chumbo appears to sell the
ATi X850XTPE for $485 shipped (!), but it's "on order" ATM.
Well, dual 6800GTs should certainly be faster than a single X850XT/PE (you're basically looking at 32 pipes at 370MHz vs. 16 pipes at 520-540MHz, so roughly 12GP/s vs. 8.5GP/s). Are they worth an extra $350 (and possibly having to change your PSU to the BFG one, which may not be as quiet/fancy as your current one)? Considering how fast the X850 appears to be in current games at even 16x12 4x16 and the fact that SLI doesn't appear to add performance in /all/ games (ATM, anyway), I'd say probably not. I'd put that $350 away to upgrade to the R600 or NV60 in a year.
But you may want the SLI combo's higher performance and FP buffer and SM3 featureset (essentially a R520/NV50) right now, and be willing to pay extra up front for a system you probably won't have to open up for at least a year (well, except maybe to add a faster CPU to better complement all that GPU power). All I can suggest is to read as many SLI reviews as you can to see benchmarks of a X850XT vs. SLI'ed 6800GTs in the games you'll play. If you'll be driving a 19x12 display, tho, and want full AA and AF, you'll probably want to go with the SLI'ed GTs.