Overclocking

The overclocks listed in this section 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.



Maximum stable clocks of our card are 910 MHz core (14% overclock) and 1220 MHz Memory (22% overclock).

Overclocking potential of the PowerColor HD 6670 seems to be a bit lower than the AMD reference design that we tested on launch day. However, since AMD's card was not retail and PowerColor's HD 6670 is only the second HD 6670 we test it's hard to give any clear estimates due to the small sample size.

Overclocked Performance

Using these clock frequencies we ran a quick test of Call of Duty 4 to evaluate the gains from overclocking.


Actual 3D performance gained from overclocking is 13.8%.

Temperatures

Temperatures are super low, unfortunately the fan is quite noisy, so the more balanced setting would have been temps in the low 70°C range and less fan noise instead.

Clock Profiles

Modern graphics cards have several clock profiles that are selected to balance power draw and performance requirements.
The following table lists the clock settings for important performance scenarios and the GPU voltage that we measured. We measure on the pins of a coil or capacitor near the GPU voltage regulator.