AMD Radeon HD 7770 GHz Edition 1 GB

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 1145 MHz core (15% overclock) and 1495 MHz Memory (33% overclock).

AMD's latest GPU overclocks well. Compared to the other cards tested today, the OC is a little bit on the lower side, as we have seen cards reach 1185 MHz.

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 17.0%.

Temperatures

Temperatures are low, like on all HD 7770 cards. I would have preferred slightly higher idle temps for less noise.

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.

	Core Clock	Memory Clock	GPU Voltage (measured)
Desktop	300 MHz	150 MHz	0.90 V
Multi-Monitor	300 MHz	1125 MHz	0.99 V
Blu-ray Playback	1000 MHz	1125 MHz	0.99 V
3D Load	1000 MHz	1125 MHz	1.00 V

CCC Overdrive Limits
Core	1200 MHz
Memory	1250 MHz