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How do you calculate the relative performance of PC RAM?

For example, what is the relative performance of the following:

If it's relevant, when they are used in a top of the line ASUS Rampage IV Extreme motherboard and Intel i7 3960X?

By performance, I mean relative:

  1. read latency
  2. write latency
  3. read bandwidth
  4. write bandwidth

Please include working. (I mean how did you arrive at the figures based on timing and DDR3-speed)

1 Answer 1

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Exact calculations are extremely complex and depend on the exact access pattern, as well as the internal configuration of the memory module ( generally not listed in the specs ). The simple calculation for latency is to divide it by the frequency, so:

9 / 2,133,000,000 = 4.219 ns
10 / 1,600,000,000 = 6.25 ns

And the simplistic calculation for throughput is to multiply the frequency by the word size, which is 8 bytes:

2133 * 8 = 17,064 MB/s
1600 * 8 = 12,800 MB/s

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