XFX announced the release of the Radeon HD 7870 Black Edition Double Dissipation graphics card. The XFX HD7870 DoubleD Black Edition is endowed with the same cooling system, which is used in the products of the highest rank. Among its strengths is to provide a direct contact heat pipes with the GPU, which makes heat transfer more efficient. The use of alternative cooling system allowed XFX to safely increase the GPU clock speed by 50 MHz, i.e. GPU clock is set to 1050 MHz. Also, the the 2GB of GDDR5 memory has been bumped up from the stock 4800 MHz QDR to 5000 MHz QDR (1250 MHz x 4). Overall this is a nice bump in clock speeds and should bring with it some nice overall performance. Source
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