I hope someone can shed some light on this for me, I have searched everything I can and have found no info on memory speed that answers my questions. For my Windows PC I use PC Pitstop to benchmark my computer. My Desktop that is a but older with DDR-400 RAM (PC-3200), runs memory throughput at about 8000 MB/s, from what I can find, this is normal. When I test my Macbook Pro memory with an OS X benchmark, I get a speed of 3500 MB/s. Also, running Boot Camp, I test the MacBook Pro at PC Pitstop with XP and I get similar readings of 3500 MB/s. PC Pitstop says that this should be a lot faster, in the 8000 MB/s range. Being that the RAM in the MacBook Pros are DDR2-667, (PC2-5200), it should run faster than the 3500 I have tested them at shouldn't they? It's hard to believe my Desktop RAM is faster than the MBP. Any info. would be greatly appreciated. Thanks!