[GTALUG] RAM speed matters in Ryzen

[D. Hugh Redelmeier]

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.