I'm not that familiar with Rightmark but it looks like there's something wrong with Rightmark's Max bandwidth then... it reports 12.8GB/s but a single stick of DDR3-1066 has peak theoretical bandwidth of 8.5GB/s.
The measured B/W of 5.6GB/s is actually not that great.
The R/W numbers could be influenced by cache.
Any chance of an Everest memory performance screen shot?
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