The launch of the Ryzen 7000 processors brings into the fray the AM5 platform along with next-gen DDR5 memory. This essentially (nearly) doubles DRAM speeds, outpacing the Infinity Fabric connecting the core and uncore CPU components. As a result, most of us will be running the IF in a 3:2 (FCLK: MCLK) configuration, rather than 1:1 or 1:2. The below chart (via: @harukaze5719, from Chiphell) shows the ideal fabric speed when paired with DDR5-6000 RAM:
The above AIDA64 MemTest was conducted with the memory and IMC in a 1:1 (MCLK: UCLK) configuration and the Infinity Fabric frequency adjusted between 1500MHz and 2166MHz. Note that DDR5-6000 refers to 3000MHz or 6000MT/s. It is to DDR5 what DDR4-3600 was to DDR4. As you can see, 2000MHz appears to be the sweet spot with this memory kit for which you’ll need a 3000MHz quad-channel or dual-DIMM pair.
Even with 3000MHz memory and 2000MHz fabric clock, you’re still getting just 63.6ns memory latency which is roughly the same as most DDR4-3600 CL16 kits. The read, write and copy speeds are a massive step over existing DDR4 modules. The price of next-gen memory modules is still an issue with even the cheapest 32GB (16GB x2) DDR5-6000 kits priced over $200, at least twice as much as DDR4.
