I am benchmark stable at 1480/7800 on both cards. I managed to de-link them and keep them at that level. My 3dmark results are as follows:
http://www.3dmark.com/fs/5501833 25692 Firestrike
http://www.3dmark.com/fs/5501866 15847 Firestrike Extreme
http://www.3dmark.com/fs/5502725 8633 Firestrike Ultra
I am pretty sure if I run this on Windows 8.1 I will add about 200-300 points to my scores as has been my experience in the past.
I have to modify the fan curve to run this speed. The fans can get terribly noisy but the temperatures remained 75 C top card and 68 C bottom card.
For gaming ofcourse, I did not want to make my computer sound like a tornado so I put default fan curves of both cards and 1450/7700. This nets me much higher temperatures at about 83 C top card and 81 C bottom card. However, the noise is about as much or slightly lower than my 970 SLi with Gigabyte.
I played Witcher 3 for a bit at 4K. Every possible setting turned to maximum settings and it was pegged to 60 fps (without vsync) to a monkey's bottom. I can't ask for more. It was a bit jarring to play at 4K w/ all sorts of AA thrown in. Image was too sharp. However, I loved it. I really wish someone would make a faster refresh monitor at 4K. I will buy it in a heart beat. I can't wait for the 3440*1440 21:9 at 75/100 Hz that I have been hearing.
Overall, I am finally at peace with these cards. I do believe that for such hot running cards, 1450/7700 is a damn good setup with audible yet tolerable noise. Since I wear headphones, I don't hear a damn thing anyways even with volume at 40%.