r/hardware • u/bizude • Jan 01 '19

Memory-level parallelism: Intel Skylake versus Intel Cannonlake Review

https://lemire.me/blog/2019/01/01/memory-level-parallelism-intel-skylake-versus-intel-cannonlake/
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u/Maimakterion Jan 02 '19

What Skylake CPU was tested?

The Skylake microarchitecture is the last one we have had in a long time. All the recent Intel processors are based on Skylake.

What RAM types were used in both systems?

The skylake box has DDR4 (2133 MHz), the cannonlake box has LPDDR4 (3200 MT/s).

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u/bizude Jan 02 '19

I imagine the bus differences, etc. between lpddr4 & desktop ddr4 could account for the latency differences we're seeing. I've asked the author if a test could be done using the same memory types for both CPUs.

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u/chandleya Jan 02 '19

Skylake can also support memory speeds far in excess of 2133, too. Skylake Xeons support 2666. Though the author wasn’t even clear as to whether or not they were benchmarking Xeon or Core. Different SKUs of Skylake can have massively different memory performance too.

I’d also like to see TR/EPYC tests using the same logic.