whats the difference between ganged and unganged memory on AMD Phenom?
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.