When we increased the memory frequency to 1333 MHz without altering the latencies, we further decreased the average main memory latency to a whopping 63 ns

Keep in mind that each benchmark uses slightly different ways to calculate latencies and bandwidth and it is not possible to compare results from different benchmarks.So what is the actual bandwidth that the i7 processors get in triple channel configuration? Intel specifies 8500MB/sec x 3 which amounts to 25.5 GB/sec peak bandwidth at 100 % bus utilization and 1066 MHz data rate per module.

At 1066 MHz data rate, the Nehalem CPUs achieve roughly 18-19 GB/sec, aproximately 76% bus utilization which is a huge step up from the Nerom architecture. At 1333 MHz memory fequency, the bandwidth shoots up to 24.5 GB/sec.