tfouto Well, the 700 series was mostly lower-powered cards (730, 740) and titanium series (750). I'm sure there are plenty of 780's that are fine?
There are no 8xx cards. That chipset was reserved for consoles/laptops. Microsoft Surface Book (Gen1) has a chip they call "nVidia GeForce" which is an 8...60? I think.
The 9xx run (970) was fine for the first half, but when the 970 had a die shrink was around when the 750ti came out. The 750ti is hit or miss for me too - I've had a good Zotac and a bad Zotac, and a bad eVGA. So the reality is... that more than likely whatever they did to FUCK their vBIOS happened around 970v2/750tiV2 era. I have no proof of this, but by empirical observation it seems accurate.
All 6xx cards were created prior to any of this fuckery. Even the most powerful ones. If you want to approximate modern power, a pair of 670 SC+ 4GB cards in SLI would certainly do the trick, although you'd need a spare 450W supply to run them. 🙂