The AMD OverDrive tool can be found in the Catalyst Control Center, but in current version 13.5 beta 2 it did not let us take the GPU clock past 1200MHz. The memory clock was limited to 1600MHz, which is actually the default clock on the HIS card. We faced the same limits when we tried using EVGA PrecisionX and Sapphire TriX tools. HIS own iTurbo software in current version 1.4.4 or MSI Afterburner allows users to override AMD’s overclocking limit, so we gave it a go. We were able to push GPU all way up to 1290MHz and the memory up to 1750MHz (effective 7000MHz). The card was stable at this clocks and we recorded up to 16% better results in Crysis 3.