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2000MHz FCLK & DDR5-6000 seems optimal for Ryzen 7000 CPUs

by John Paul
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The Ryzen 7000 CPUs launch raises frenzied discussion about the performance of the AM5 platform with next-gen DDR5 memory. This essentially doubles DRAM speeds, outperforming the Infinity Fabric connecting the core and non-core CPU components. |Consequently, most of the users will be running the IF in a 3:2 (Fabric Clock: Memory Clock) configuration instead of 1:1 or 1:2. The following chart (source: @harukaze5719, from Chiphell) reflects the optimal fabric speed when combined with DDR5-6000 RAM:

The AIDA64 MemTest was run with the memory and IMC in a 1:1 (Memory Clock: Unified memory controller ClocK) configuration. While the Infinity Fabric frequency was adjusted between 1500MHz and 2166MHz. We know that DDR5-6000 refers to 3000MHz or 6000MT/s. Now it is to DDR5 what previously DDR4-3600 was to DDR4. The chart shows that 2000MHz appears to be an optimal point of action with this memory kit. However, you will need a dual-DIMM pair or 3000MHz quad-channel for an optimal run.

Note that, even with a 2000MHz fabric clock and 3000MHz memory, you will still get just 63.6ns memory latency. It is roughly equivalent to most DDR4-3600 CL16 kits. The speeds of read, write, and copy are huge steps over the current DDR4 modules. The prices of next-gen memory modules still pose an issue because even the cheapest 32GB (16GB x2) DDR5-6000 kits will go over $200. It is at least twice the price of DDR4. So, you will have to burn a hole in your pocket to get the sweet spot for your Ryzen 7000 CPU.



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