Got my GTX 670 OCd and tested. Looks like a boost just above 1315 is my tops. Strangely, my card does not like any voltage above the default. I am at 0.988v, with the following:
Default: 1085(Boost)/1502
OC'd: 1215(Boost)/1700
Max GPU temp at 100%:
74C
Max TDP at 100% load: 87.6%*125% maxTDP(as set in Precision) = ~
191.6w
Max voltage at 100% load: 1.162
Using the same Uningine settings as tempered, here are my results and GPUZ screenshot:
Note: CPU freq is not accurate in picture below (see sig)
Very impressed with the card so far. I could probably tweak a little higher, but this looks really good to use for now!
Edit: Updated picture to represent tweaked settings. I continued to stress test while pegging all 6 CPU cores at 100% and noticed it was getting unstable. These new settings represent 2+ hours of GPU and CPU cores at 100% with 25C ambient temp. This represents the worst conditions I can simulate, and I will have this run overnight to test the final stability. Overall I am looking at a 24% core OC and 13% memory OC. Not too shabby.