Compute max memory bandwidth of a processor

memory cpu bandwidth
Robert picture Robert · Jun 25, 2014 · Viewed 11.9k times · Source

I'm reading this CPU specification: http://ark.intel.com/products/67356/Intel-Core-i7-3612QM-Processor-6M-Cache-up-to-3_10-GHz-rPGA

It says the CPU has 2 channels. So I think it has 2 memory controller inside. Then the max memory bandwidth should be 1.6GHz * 64bits * 2 * 2 = 51.2 GB/s if the supported DDR3 RAM are 1600MHz. But the specification says its max memory bandwidth is 25.6 GB/s. I multiplied two 2s here, one for the Double Data Rate, another for the memory channel.

Is it the problem of the specification? or I have some miss understanding?

Answer

DCKing picture DCKing · Jun 25, 2014

Double data rate memory specs usually already take into account that its effective frequency is doubled. "1600 MHz memory" really runs on 800 Mhz, so you can leave out one factor of 2 from your calculation.

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