Originally posted by: Rollo
I don't think ATI really cares much about Crossfire, it seems like they're only offering it because nVidia does.
I think so too; I think Crossfire is simply so they don't lose face and show that they can do a dual GPU solution. Whether or not they do it
well seems to be irrelevant to them at the moment. Which is ironic because all ATI are doing with Crossfire at the moment is losing face.
Anyway, if this proves correct, my guess is there's something about the 512s that doesn't make them good candidates for multi.
I don't think there's anything flawed about the 512MB cards, but I do think that several factors could be reason for the Crossfire X1800 XT card to be 256MB:
-512MB may be unnecessary for Crossfire. Until we see benchies showing 256MB X2 cards vs 512MB X2 cards we will never know.
-They can sell the Crossfire cards for around the same price with half the memory
-They don't really think anyone will do Crossfire so they are doing it half-assed, like the rest of Crossfire's excecution
Ever since ATI announced that Crossfire would require a "master" Crossfire card, I knew it wouldn't be as good as SLI, simply because the Crossfire cards will be produced in a much smaller quantity than the regular cards. With SLI, you buy two similar cards (or even from different manufacturers if you're brave) and run them in SLI; with Crossfire you're forced to buy special master cards that run at inferior clockspeeds (notice the X850 XT crossfire runs at XT speeds, not XT PE speeds and that the X1800XT Crossfire is 600/1400 with 256MB, yet the only card you'd pair it with if you're sane is the X1800XT @ 625/1500, 512MB?).
Another reason these master cards are annoying is because you can't find a hot deal for two similar cards and then run them in Crossfire. If X800GTO2's were Crossfire-able by themselves, this would probably be the #1 combination. As it stands, X850 crossfire master cards are rare-to-nonexistant (nevermind Crossfire motherboards).
Having to use a secondary proprietary master card makes it an uber-niche: you
really have to pay a premium for Crossfire. At least with SLI you can find a good deal on some 7800GT's and rock the house @ under $600 for the pair. This is not an option on ATI at the moment.
Nonetheless, as it stands, neither Crossfire nor SLI impresses me that much. I personally won't be running either for awhile simply because I'd rather run a single 7800GT over two 6800GT's in SLI (and pay less for the 7800GT as well), and 2X 7800GT's cost way more then I'd personally spend on video equipment. For those who are willing to spend over $600 on graphics cards, though, SLI is the best and only option IMO.