Originally posted by narciso
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It's the same thing you see with GPUs and their bit rate, the increased bitrates are more channels being added to the GPU's memory controller. On low end GPUs you'll see various memory setups on the same chip, these are because the manufacturers are allowed allot of leniency in what they use, most of them support 128-bit GDDR1-2-3-5 but can be found in a setup as low as 32 bit, which is caused by the manufacturer only installing higher capacity memory chips on one channel to cut costs.
Now that said, AMD had previously stated that increasing the number of memory channels on a CPU only system results in increased latency and generally ends up as a wash performance wise. With a GPU in the mix I've got no idea if quad channel system ram would be of help for the APU as the increased bandwidth may help the GPU side but hurt the CPU side on latency.
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