one thing I can reassure you- its not a power issue. titan sli can run on a 750w psu
Now, what happens when you run a game on a single monitor without nvidia 3d vision surround. Do you still get a crash or system instability?
How about the gpu usage and temprature? how do they get affected by 3d vision surround. use msi afterburner or other softwares to monitor these.
Since, I never had the privilege to run nvidia 3d vision surround myself, I cant help you out thoroughly in this.
As i stated in the OP. I ran valley/prime95 for 9 hours on stock speeds, one monitor-sli. GPU usage across 3 monitors is usually kinda low, this has been attributed to A. cpu bottleneck, and B. Titans are OP and dont need 99% usage in most programs to push smooth 60fps.
once again, as stated in OP. The system is all under water, with plenty of rads.
new question related to issue: Can not syncing gpu clock speeds cause driver failure?
I have 2 way sli titans mine are doing to same ... I figured it was heat as mine are air cooled have you try testing both card own there own ?? that's my next step to make sure they both work ....
My issue ended up being caused by the extra heat being dumped into my loop, causing the CPU to get pissy. Some one posted that sli titans can run on 750w PSU... Maybe if they and the CPU are 100% stock. I have clocked my bios modded soft volt modded titans @ almost 500w @ almost 1400core.
Your cards shouldn't really over heat unless they are pushing 90c+