|HIS Radeon HD 7770 iCooler Video Card|
|Reviews - Featured Reviews: Video Cards|
|Written by Steven Iglesias-Hearst|
|Friday, 04 May 2012|
Page 17 of 18
HIS 7770 iCooler Overclocking
Before I start overclocking I like to get a little bit of information, firstly I like to establish operating temperatures and since we know these are nice and the iCooler is very capable we can quickly move on. Next I like to know what the voltage and clock limits are, so I fired up the HIS iTurbo overclocking utility. I wasn't able to adjust the vCore due to hardware limitations. Clock speeds had a seemingly infinite range of adjustment (as with the HIS HD 7950 IceQ) and I suspect that this is a feature limited to the HIS iTurbo v1.1.1 utility as I couldn't achieve the same result with MSI Afterburner. Since my only limitation was running at stock voltage this overclock run was just a case of bumping clocks and testing stability.
Without being able to raise the vCore I was able to push the GPU core clock to 1120MHz (+120MHz) and the memory to 1600MHz (+475MHz - 6.4GHz effective) which required very little effort at all. I am impressed by the capabilities of the HIS HD 7770 iCooler 1GB video card. I did manage to clock the core clock higher but it was only at this speed that it could pass through every benchmark without crashing.
Armed with a 120MHz GPU core overclock and a staggering 475MHz memory overclock, we went back to the bench and ran through the entire test suite. Overall we saw an average 22.35% increase in scores (at 1920x1080 resolution), with performance on par with and mostly beating 1680x1050 scores. This is very good considering we couldn't adjust the voltage any, which suggests there is more headroom yet to be had for those who like to void warranties with volt mods and such.
We also re-ran temperature tests at the overclocked speeds at a slightly higher ambient temperature of 25°C. The iCooler on the HIS HD 7770 once again did not fail to please, pushing the temperature up with FurMark saw the GPU load temperature rise to 63°C (30% fan speed). Next I tested at 100% fan speed and the temperature dropped to 55°C, chopping 8°C off the top. Cracking little cooler, or Advanced Micro Device? You decide.
That's all of the testing over, in the next section I will deliver my final thoughts and conclusion.