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I recently upgraded a machine from an AMD X2 CPU to an AMD Phenom X4 and notice options for toggling ganged vs unganged for the DDR2 memory on that machine.

Can someone explain what the difference is between the two? Which setting is most suitable for a general purpose file/app/db server?

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up vote 3 down vote accepted

Long story short, ganged treats the memory subsystem as a single 128-bit bus, while unganged treats the memory subsystem as dual independent 64-bit buses.

Ganged favors some single-threaded software, but AMD generally recommends unganged for typical modern system configurations, especially if you are commonly multitasking multiple applications.

Basically, Gang versus unganged is more about the memory access model being used.

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