Totally go AM2, it doesnt make sense not to, plus that's the platform that the next generation AMD chips will be on.
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Originally Posted by "Pacaveli"
whats the difference between 754, 939, and AM2 sockets. In both respects of the CPU and Mobo.
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The only thing that the CPU changes as far as the motherboard is the RAM. (what type and what bus)
754= supports sempron,(939 doesnt, think there are some AM2 semprons), uses DDR 184 pin, does not support dual-channel memory (which can potentially double your memory's speed as far as the bus goes)
939=supports dual channel, otherwise the same as 754. maybe the pin count is faster, although i cannot confirm that.
AM2= supports dual channel DDR2, which runs double the speed of DDR, yet it has a much higher latency. Very stable. (the pin count on AM2 is 940 which is what the current server chips that AMD makes are using, the pins are just placed differently)
This Wikipedia article should help a lot.