Everything starting with Fermi 400 series and beyond is supported. If I am not mistaken, other than some low end re-brands, the last pre-Fermi card that's even half decent came out on
April 2, 2009, or nearly 6 years ago -- and it was the GTX275:
http://www.gpureview.com/show_cards.php?card1=609&card2=
I definitely think NV focusing its efforts on DX11 Fermi and beyond is a good way to spend your financial resources as optimizing for anything below seems like a case of diminishing returns when a $100-120 750Ti is as fast as a GTX480 in a sub-60W power envelope! I have a GT620
Having said that, there is no doubt that NV is prioritizing Maxwell over Fermi and Kepler and the former architecture is simply better for modern titles. It's impossible to tell what fraction of Maxwell's performance advantage over Kepler is due to NV's better driver focus on Maxwell and what fraction is related to poor compute shader performance of Fermi and Kepler (modern games are more likely to use compute shaders since PS4/XB1 are based on Compute shader GCN architecture).
I would say that unfortunately you missed the perfect time to sell your 780 card as many users were able to offload them for $275-285 right before 970 dropped and got a cheap side-grade. 780 @ 1.2Ghz is still a potent card. I think you can coast for another 1-2 years until 14nm GPUs depending on your willingness to turn down settings. Alternatively, you can wait for major pricing re-adjustments on 980 once R9 300/GM200 cards launch and decide if you want to upgrade to a 980 or the higher end cards. Since you didn't jump on 970/980 around launch, I'd say just keep waiting at this point.
You seem to get a sick enjoyment out of this. Do you applaud when people have hardware failures also?
I don't think he would have upgraded from 780 SLI if the performance was consistent since launch when 780 clobbered a 7970Ghz. I think he is just laughing at the NV fanboy(s) who bought his used card(s) while he was able to get XFX R9 290Xs and shockingly end up with profits are selling his 780s. It is pretty funny and sad at the same time when you think that someone in the US would be so brand-brainwashed/blinded enough to pay more for 780s with
less VRAM, way
worse SLI performance and the cards being used vs. brand new lifetime warrantied 290Xs with a free game that can be resold too.
In this hobby it often pays to upgrade more often, even if it means switching sides because videocards just keep depreciating and games get more demanding.
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