Originally posted by: apoppin
I remain VERY interested in this topic as i do - eventually - expect to do this upgrade. in the meantime. 'pardon me' if i remain a single GPU owner with an interest in multi gpu solutions. . . . i am constantly looking for best band-for-buck and do not feel unqualified to help people here in Video.
That's one of the most interesting things that have come out of multi-gpu configs so far-- the price-performance equation has often been thrown on its ear.
Obviously right now isn't the best time to buy a high-end gpu solution with new cards around the corner, but if we rewind a month or two, we see $500 single-card solutions being offered by nV and ATI. Then, you have the <$600 7800GT SLI solution that performs better than all the high-end cards, and is either just a little bit more expensive (compared to the x1800xt at that time, as well as the 256GTX) or cheaper (512GTX).
Price is the obvious obstacle for multi-gpu (just as it is with any high-end single card solution). There are other obvious ones too that get mentioned a lot-- extra heat, noise, and power usage, as well as the need for the proper mobo. There are some other obstacles that I don't think enough buyers consider-- what monitor they use (i.e. being res-limited on an LCD) and what games they play.
With games these days, you're gonna get a whole lot more performance from spending your money on an A64 3000+ with cheapie ram and SLI 7800GT (~$800), than you will from an A64 4000+ with super-fast ram and a single 7800GT (~$800). (Granted a faster processor will help in many other apps, but I'm speaking mainly about gaming here.)