Kingston produce "ultra low latency" HyperX DDR3 SO-DIMMs which have CL5. As this is 40% less latency than the more common CL7, would the 2009 MacBook Pro benefit from this extra speed or are its minimum timings fixed? I cannot find any information on this on the web and so I am hoping that someone familiar with the 2009 MBP chipset may be able to comment.
Interestingly, I found two independent reports (one in the US on Apple forums and the other sourced from Korea) that say the new 13" MacBook Pro (mid 2009) runs its memory at 1333MHz if sufficiently fast modules are installed and the memory is reported as DDR3 1333MHz in 'About this Mac'. One said that their previous generation, 2008 unibody MBP would not boot with the same modules, except when one module was mixed with a standard 1066 MhZ module in which case they would run at the lower speed. As 1333 Mhz and faster DDR3 SO-DIMMS are CL9 or worse, then there is no speed benefit (1333/1066 x 7/9 = 0.9726, i.e. the faster-clocked memory is actually nearly 3% slower - if things are as simple as this). However, this does indicate that the 13" 2009 MBP may have a revised chip set.
Any thoughts?
Interestingly, I found two independent reports (one in the US on Apple forums and the other sourced from Korea) that say the new 13" MacBook Pro (mid 2009) runs its memory at 1333MHz if sufficiently fast modules are installed and the memory is reported as DDR3 1333MHz in 'About this Mac'. One said that their previous generation, 2008 unibody MBP would not boot with the same modules, except when one module was mixed with a standard 1066 MhZ module in which case they would run at the lower speed. As 1333 Mhz and faster DDR3 SO-DIMMS are CL9 or worse, then there is no speed benefit (1333/1066 x 7/9 = 0.9726, i.e. the faster-clocked memory is actually nearly 3% slower - if things are as simple as this). However, this does indicate that the 13" 2009 MBP may have a revised chip set.
Any thoughts?