Wizzard, I don't have a 64gb module, but I do have a 32gb module. If you are interested I can benchmark the 32gb module on my PB later today (I will edit this post). That said, I doubt there will be any difference in performance.
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Timing cached reads: 864 MB in 2.00 seconds = 431.78 MB/sec
Timing buffered disk reads: 222 MB in 3.01 seconds = 73.67 MB/sec