Mid-Range AMD Graphics Card Round-Up (HIS 7770 GHz / HIS 7850 / Sapphire 7850)

We used HIS' own iTurbo software to increase the 7770 GHz Edition IceQ X Turbo graphics card's core and memory frequencies after raising the board's power control setting to +20%. Voltages were kept at their default levels.

FurMark's GPU Burn-in mode was used to verify stability, along with Crysis 2.

HIS' 7770 GHz Edition IceQ X Turbo graphics card features a factory overclock which puts it above the 7770 GHz Edition's reference frequency by 10%. The memory is also factory overclocked by 75MHz, to a value of 1200MHz.

Our highest and most beneficial overclock came via a setting of 1100MHz core frequency and 1475MHz memory frequency. We did manage to push the core to 1150MHz, but this reduced the headroom for our memory overclocking and had a negative impact on gaming performance.

The almost 23% increase in memory frequency was very pleasing, especially given that Elpida's W2032BBBG-50-F memory chips don't feature the overclocking headroom that the earlier HD 7000 series cards' Hynix chips do.

We were pleased to obtain an increase in gaming performance, even though our core clock remained at 1100MHz.

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