XFX 5770 Overclocking
A quick GPUz shot to remind us of the original bandwidth/pixel/texture rates.
For overclocking I used the Catalyst Control Center which came with the 10.4 driver set, cranked the fan speed as high as I could stand (which was only 80% as the fan on this thing is louder than anything I’ve used in the past) and I managed to get a nice 100MHz core bump and an additional 200MHz on the memory.
The sped up memory netted a solid 12GB/s of bandwidth, and the core speed gained 1.6 GPixel/s and four GTexel/s. This is not a spectacular gain but decent nonetheless.
In 3DMark Vantage the overclocked XFX Radeon HD 5770 picked up a solid 1100 3DMarks which was enough for it to pull ahead of the factory overclocked GeForce GTX 260-216, and is an 11% improvement over stock clocks.
With Furmark the overclock netted a solid 6fps at the low widescreen resolution, and 8fps at 1920×1080 which is an improvement of 11% and 18%, respectively.
Throughout most testing, the gain from the 100/200MHz overclock was either 10-11% or up to 14-15% in heavy tessellation scenarios like Unigine Heaven 2.0 and NVIDIA’s Island tessellation demo. This is not too shocking as the core overclock was 11% itself and the extra memory speed was a difference of 16%, so not much more can be expected.