First up is the new Palit HD 4870 which does not use the AMD reference design. The cooler is equipped with two fans and is much quieter than the normal cards. The HD 4870 Sonic Dual features DisplayPort and a Turbo switch which allows you to change the clock frequencies on the fly. When in "Turbo" mode, the card runs at 775/1000 and 750/950 in "Normal" mode. Even in normal mode this is still an overclock over the AMD reference clocks.

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