Overclocking
To find the maximum overclock of our card we used a combination of GPUTool and our benchmarking suite.
The overclocks listed here were achieved with the default fan and voltage settings as defined in the VGA BIOS. Please note that every single sample overclocks differently, that's why our results here can only serve as a guideline for what you can expect from your card.
The overclocks of our card are 850 MHz core (21% overclock) and 1380 MHz Memory (20% overclock). Really nice overclocking, especially for a card with all-new technology. Essentially you can buy a HD 5750, overclock it to HD 5770 performance levels and party away the rest of the money.
Using these clock frequencies, we ran a quick test of Call of Duty 4 to evaluate the gains from overclocking.
The actual 3D performance gained from overclocking is 17.3%.
Temperatures
Temperatures are really low. Even with massive overclocking, the temperatures are in a perfectly safe range. On top of that the fan is whisper quiet, HIS did really good work here.