So is it smart to get SLi or Crossfire, as an upgrade path? In my view any multi gpu setups have too many issues to be even considered as a good option, so as an upgrade path, I wouldn't even think its remotely good, a single card upgrade is better, you might end up spending more but you will have that single card longer than an old generation dual card setup, and once these cards go to EOL driver support for multi GPU will be on at the bottom of list for these companies.
My quadfire 5970s lasted from June 2010 to July 2013, 1.5 years into the 7 series and that's because i future proofed by getting 4GB versions 2GB per GPU, if i had bought the 2GB version 1GB per GPU i would of had to upgrade much much sooner and i would have used them for even longer if i had not abused them so much which lead to the Vram starting to die due to some heavy Ocing over the years and CF was still being supported and running great, 1.5 years into the 7 series which was well past EOL.
As for opinions of CF that is another matter for the individual and what that individual wants to achieve and the fact of the matter is if someone wants to make a CF setup last as long as possible then you get as much Vram as you can afford as many 5970+7970 1GB per GPU owners said they had to upgrade because the Vram not being enough in the long run.
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