Videocards for rendering Seem backwards. Building a workstation need help.

For the most part i've seen these benchmarks are accurate. I did my own test on my system for cpu and gpu and they were updated immediately. (not very good 960m 135 seconds) but it was accurate.

This was not my only source showing the 780 in 2 and 3 way sli outperforming newer cards. please look for yourself but, I didn't find it necessary to spam a question with repeat info.

Also the 780 runs on different architecture then the 680 [significantly different hardware] so using that as a baseline to say the benchmark is false doesn't hold up.
This is a tech forum for asking questions there is no need to be rude.

If you look at the last entry in that GPU benchmark, you'll see there 3x680 rig with score of ~4000 seconds. Now if you believe that 3x780 rig has 200 times more computational power than 3x680 rig, then well... good luck in building your own rig ;]

I'd suggest to do further search and look for more trustworthy benchmark, because that one you linked, is clearly nonsense.