My 920 will hit 3.7 on my cheapo scythe katana ii but its not stable due to how hot it gets. At 3.5 with 1.51v, the katana ii can barely keep it cool when idle. As soon as its taxed it spikes to 55-58 c and after 5 minutes its above 60c. For now, I have it running at 3.2 on all stock volts. It idles at 35-38c and full load is around 50c. Once I get my water setup in a couple months I'm planning to run 3.6-3.7 24/7. The thought of using a $60 heatsink with a loud high RPM 120mm fan(s) is not something I'm willing to do. I kinda built my rig for quietness (see rig in sig). Water FTW. I think the 920 is a huge bargain and people are overlooking it simply because it doesn't have an unlocked multiplier. I absolutely have no regrets about going with the 920.
Here is a 3.2GHz (all stock volts) run with my GTX at 720mhz.
http://img.techpowerup.org/090202/13...arkvantage.jpg