At this point the damage is done so I wouldn't dwell on it and risk people making you feel bad about your decision.
Upsides are lower power draw, better multi gpu optimization as you stated in 2 versus 4 gpu's and the fact that you already have the Titans installed and setup and the GTX 690's after being sold will make it a financial side-grade.
Actually it doesnt bother me at all from switching back and forward, but Im thinking that once I get the 3rd Titan.... it might be something else
There was gpu to gpu latency if you ever notice.... In my SLI 690s, I found out that quad gpus take time to coordinate (i may be wrong). Once they are good to go, they are very powerful, but the time it takes, it increases the latency for immediate responce on what program needs
Edited by VicVic, 07 March 2013 - 06:45 PM.