On Ryzen systems based the latency and available bandwidth for all connected components like the DRAM controller, PCIe bus, etc. on the Infinity Fabric speed (FCLK). The Infinity Fabric clock speed (FCLK) is configurable and directly relates to the memory clock (MCLK). For Ryzen 3000 CPUs, most will run a 1:1 ratio between FCLK and MCLK, which can be considered “synchronous” operation, up to 1,800MHz. There may be instances where the FCLK may be set to operate in an “asynchronous” mode (not a 1:1 ratio), which may introduce increased latency, thus negating any performance benefit. However, for extremely high MCLK values, asynchronous operation may actually increase overall performance, at the cost of stability.
Recall that for this, the FCLK to equal MCLK for the best overall performance. Actual MCLK value its 1,800MHz. Latency penaltiesare incrrued if FCLK and MCLK are mismatched, high MCLK can thats negative for stabilty operation.