I know there are a lot of posts on here asking for advice on this topic, I have lost count of how many I have read. But I haven't come across one that has covered which would be the better upgrade for 3D vision.
My specs are:
I7 990x @ 4.1/ 4.4 /4.8 or 5gh on different OC profiles
Asus X58 Sabertooth
OCZ vertex 4 SSD (OS)
OCZ vertex 3 Max IOPs (games)
1 TB HDD (storage)
8 GB Dual channel Ripjaws @ 2133
GTX 580 Asus Direct CUII sli @ 904/4200
Benq 2420T 3D vision 2 (1080p)
The Witcher 2
Just a few games I play in 3D (settings turned down!)
I know I'll get more performance with the two 770's but I like the idea of being able to add another 780 in the future when needed to run new releases in 3D.
I know I'm still running on the old 1366 but I haven't had any CPU bottleneck problems & as far as I can tell with extensive research is I should be able to run PCI 3.0 fine on my motherboard but I'm not sure if the two GTX 770 would bottleneck my old hardware.
Perhaps the single chip? It's an excessively powerful model on it's own you must remember. SLI and CrossfireX have been proven to be less reliable and stable than a single chip on it's own as well, and with 3D being a rather new and complex technology in the scheme of things, one card would probably have the edge in my books, not necessarily in power (but it sure as hell does well, fantastically I would say) but in reliability and stability.
Cheers Iain for your speedy reply, I must say I'm more leaning towards the one card solution. With my current GPU's (580's sli) I initially had a lot of problems, mostly driver related. But with the the more recent driver releases they seemed to have fixed a lot of the of the issues & I haven't really had any problems since.