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Calculation of Xeon server memory bandwidth

I am looking at a dual socket server based on the Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz

The configuration looks like this.

  • 4 memory channels per socket

  • DIMMs are 8x32 GB DDR4 2133/1866 modules per socket.

JEDEC says DDR4/1866 peak transfer rate is 14.93333 GB/s. Given that there are 4 memory channels, can I assume a (theoretical) memory bandwidth of 4x15 = 60 GB/s?

None of the benchmarks (single-threaded reads) I have gets close to that, they max out around 9 GB/s.

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