The ZOTAC GTX 980 Ti AMP Extreme is a nice card; however, mine would not overclock much higher (only 55 MHz on core and nothing on memory). This is a highly overclocked card already, but it did not satisfy my want to reach higher limits.
So I purchased the EVGA GTX 980 Ti Classified. Here are the results after playing around with it a bit/\
EVGA GTX 980 Ti Classified default:
Core (boost) 1392, Memory 1752
Max OC:
Core (boost) 1512, Memory 1976
In both Valley and Heaven, you will find that memory overclock gives much better results. I have a fresh install of Windows 7, but I think I had Origin and Steam running. Didn't bother to kill any processes.
The strange thing is, I was able to achieve much higher memory overclocks on Valley versus Heaven. I think it is driver related though...
You have a Kingpin? I didn't even know they were released yet