Quote:
Originally Posted by cDnStealth
GDDR5 has a higher clock speed but only runs on a 32 bit bus whereas DDR3 runs on a 64 bit bus. Even though DDR3 is about half as fast, it's bus width is twice as wide so the bandwidth achieved is about the same as GDDR5. Also, GDDR5 has much poorer latency compared to DDR3.
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Except GDDR5 memory controllers handle input and output on the same clock cycle whereas DDR3 doesn't. It really depends on what kind of operation is going to be most prevalent on the system. For gaming and GPU operations GDDR is preferable, for multimedia probably DDR3. MS has the whole we want to replace every device in the living room so DDR3 makes sense in this case but will likely result in a hit for gaming.