[citation][nom]spks19[/nom]I read this as, "Buy one 5970 now, and in 2 years get a second one."[/citation]
Doesn't work that way. SLI/CF are only useful for new builds are within the first 6 or so months of a cards life on market. Steam stats show that only 1% of users actually ever use a dual card setup.
Top end cards are always the FIRST to die and be replaced by newer products. Why would anyone buy yesterdays $500 card? Bottom end cards will last for years... ie: 5200, 6200, 8400... ATI 9200, 2600, 3400s.
So in two years... a 2nd hand 5970 will be worth about $100... if that. And if somehow 3G gaming is worth-while in 2 years for PC (with consoles getting very OLD and a year or so before PS4)... the ATI 7850 maybe faster than two 5970s... for all we know.
2004 - ATI 9800Pro was a top end $400.
2006 - ATI 1900XTX was a top end $500, allowed CF (2 cards)
2006 - GF 8800GTX hits market at $500, instantly devalues the 1900XTX.
2007 - ATI 3870 hits market at $200, easily twice the card of a 1900XTX
(Why would someone buy another 1900 unless it was $100? The power and cooler requirements go up for dual cards)
2008 - ATI 4670 hits market at $75, almost equal to the 3870.
2008 - GF 260 & 280 hit the market at $400/$650... fastest GPUs.
2008 - 2 weeks later, ATI 4850/70 hit market at $250/$350... not as fast as GF 260/280... but fast enough that who would spend almost double for a 5~10% performance increase. Nvidia quickly reduces prices of GF2xx cards to $300/$400... loses lots of profit.
Fermi will be a repeat of the GF GTX2 cards. (GTX letters in front of name is stupid). Lets refer to all Geforce cards without the useless letters.