|VisionTek Killer HD5770 Combo Card|
|Reviews - Featured Reviews: Video Cards|
|Written by Steven Iglesias-Hearst|
|Wednesday, 16 February 2011|
Page 18 of 19
VisionTek Killer HD5770 Overclocking
The clocks on the Killer HD5770 are already quite high so I wasn't expecting to have much headroom to play with clock speeds, also working against me was the lack of over voltage support. Armed with my lack of confidence I went ahead to try and break any barrier that was put in front of me, first I fired up AMD Overdrive in the Catalyst Control Center and noticed that the GPU clock had a cap of 960 MHz but within not too much time I had hit that wall and AMD Overdrive still called it stable, it wasn't until I fired up FurMark that I found out otherwise.
Several restarts and runs of FurMark later and a switch from AMD overdrive to MSI Afterburner found a stable GPU overclock of 910MHz (+60MHz). After tweaking the GPU I moved on to the memory, a little research showed that the Elpida RAM chips used on the Killer HD5770 were rated at 5GHz (1250MHz) so I knew there was a little headroom to play with. Armed with this I proceeded to crank up the memory speed till I hit a wall at 1315MHz (+115MHz).
Armed with a moderate overclock we went back to the bench and ran through the entire test suite. Overall there is an average 10% increase in scores (at 1920x1080 resolution) which amounts to an average 1.5% to 2% increase in frames per second. We also re ran temperature tests at the overclocked speeds at the same ambient temperature of 26.6°C. The Killer HD5770 idled at 50°C (fan speed 43%) and at full load it was 84°C (fan speed 64%), at 100% fan speed we saw the temperature drop to 82°C but once again the fan noise was too much to bear for the sake of 2°C.