
Si c'est des 8Go je t'en prends 4

Installing 8 modules instead of 6 modules drops the memory bandwidth from triple-channel to dual-channel speed, and this shows up in memory testing quite clearly, as graphed above.
Optimal configuration for the MP09 is always six modules. But except (possibly) for extremely specialized applications which thrash all 16 virtual CPU cores, the difference is unlikely to ever matter by more than a few percent, at most. More likely is that such programs will suffer by not having an adequate amount of memory, leading to more disk activity, which might be 100X slower.
(...)
Memory copy speed is 52% faster with six modules instead of eight (triple vs dual channel).
(http://macperformanceguide.com/Reviews- ... emory.html)