Overclocking

To find the maximum overclock of our card we used a combination of ATITool's successor 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 final overclocks of our card are 760 MHz core (8% overclock, 20% over reference clocks) and 1305 MHz Memory (4% overclock, 15% over reference). These overclocks are simply amazing. AMD has been praising the overclockability of their RV790, but our testing didn't see much of it. NVIDIA on the other hand hasn't said a word and we see massive overclocks. Good job.

Overclocked Performance

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 is 5.1%, 15% over reference.

Temperatures

Idle temperatures of the Zotac GTX 275 Amp! Edition are comfortably low. The load temperatures are at what I would consider a safe maximum. As you saw on our noise testing page, the fan is already running really fast which means the thermal capacity of the cooler is pretty much maxxed out.