Being single slot cooled cards we need to be careful when increasing the clock speeds, we are already seeing 81c with Furmark, so we will proceed with a little caution.
The maximum clocks we reached were 890 mhz on the core and 1240mhz on the memory, an increase of 40mhz on each. This didn’t help performance much, a single frame increase in Crysis Warhead for example.
When overclocking, the core temperatures rose by around 3-4c hitting 85c when running Furmark after 30 minutes. We don’t think this overclock is worth the minor performance increase at the expense of higher temperatures.