My impression has been that for ordinary workloads, RAM speed hasn't
mattered much recently. The reason, I assumed, is that modern processors
had pushed caches and out-of-order execution quite a distance.
This article shows that the Ryzen 5 240g performance is affected by RAM
speed. The article doesn't mention number of channels, but that should
matter too.
<https://www.extremetech.com/computing/263783-evaluating-ddr4-scaling-ryzen-5-2400g-higher-clocks-boost-performance>
How come? I suspect that the clue is here:
"The CPU-GPU interconnect system uses AMD’s Infinity Fabric as well, and
Infinity Fabric’s clock is directly tied to DRAM clock."
I wonder if cranking up the DRAM clock, but adding latency cycles,
would improve performance without requiring faster RAM.
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