Soldato
Got an Inno3D X2. Not the best cooler around, but it'll be going under water in a couple of months.
Not a great clocker to be honest... or more accurately, just heats up like crazy. Clocks up to ~1900, but typically runs at ~90C with fan at 100% (stock volts, +100 on core clock). Sits at 1900 in games and heaven, but drops down to ~1800 in firestrike stress test.
All of this is with an open case as well :| I've got decent enough airflow, but it can only get worse with a closed case. At least it was fairly cheap (£650).
Seems that I get better performance by keeping the power limit at 100%, or even dropping down to 95%. No artifacts or lockups (yet) at +120 on the core clock, and temps stay a few degrees lower, leading to less throttling. It mostly stays at 1920Mhz now. Might be a good sign for when it goes under water. Perhaps the TIM / GPU connection is a bit crappy? Or is the Inno3D X2 cooler really this bad?