ITs basically dual 260 SP 240 with 55 nm, its still 1795 MB and 448 bit architecture.
1 295 GTX has been seen to be noticeable weaker than 2 280 GTXs.
1 295 GTX suffers from microstuttering most noticeable in Left 4 dead. Though drivers will improve, dual GPU cards have been know to be more prone to it than regular 2 card setups.
the RAm will end up being the thing that breaks the 295 GTX as games will have higher texture quality, AA and Resolution standards increase.
Also it runs hotter than 1 280 GTX.
I would say find a 285 GTX since it OCs alot more than both, and can sometimes be found cheaper than the 280 GTX.
Latest THG benchmarks review show the tri sli setup runs better than 2 295 GTXs, and with the price cuts its a better Price/Performance ratio.
NOt only that quad sli scales like nothing since that what you'll be getting
I had both types of setups, so your hearing it straight from the horse's mouth
295 GTX > 285 GTX > 280 GTX > 260 GTX
Again AVG frames don't tell me personally anything, as I'm more of a min frame person now