So basically a fairly mixed bag. The Metro benchmark seems about ok, but concerned with the min FPS of 8 that I got repeatedly. Thats the same min FPS as my SLI 560s, although well over double the avg. I also noticed from the graph that the fps was very inconsistant, almost looked like microstutter (although not when you were looking at the screen)! My single 560 gave a much smoother trace but obv at very very low avg fps.
Heaven benchmark is looking pretty good, but rather alarmed by the 3DMARK one. Over 1k score below the reference 780ti. Hell its even below the reference 780 going by Toms figures. Thing I noticed from a really quick look at the 3DMARK results page is that I couldn't see a Zotac 780ti above 9700 score or so, but loads of other brands getting way higher. I've not investigated this further yet.
I also ran MSI Afterburner torture test on the highest settings it will do and after 10 mins of cpu @98% load the fan was only just audible, fan speed was 68% and temp was 74 degress with a room temp of 25 degrees.
I should also mention is that I could hear a clicking sound from the card when I first installed it, almost like a fan was wobbling/rubbing, but that seems to have disappeared this evening.
I have loaded up a couple of games eg CoD Ghosts, Civ5, Skyrim and turned them to max settings and the difference is unbelievable from what I had before. Using Fraps I can see I rarely drop below 60fps in any of them, and the smooth frame rates with all the extra graphics turned on is a major step up in gaming pleasure