Thanks for all the feedback, I'll be honest I don't overclock these cards at all (apart from some initial bench tests which they got too 950/2200 @ max locked voltages), the reason being I love the quietness of these cards as at stock they don't reach over 65 degrees and never need to go higher than 60% fan speed which is very quiet.
The main reason I wanted too go for three was for cheep future proofing, at the moment I've never really dropped below 60fps @ 2560x1440 with FXAA, however at that resolution adding max AA still pushes these cards too some less than desired frames especially in heavily modded Skyrim.
My CPU runs fine at a conservative 4.2 so it runs cool.
I'm starting too get old I think, preferring cool & quiet over OC performance. I mean including GPU's & PSU my case holds: 18 fans all running as quiet as possible