CPUsMemory and Storage

DDR5-6000 Memory and 2000MHz Fabric Clock Seemingly the Sweet Spot for Ryzen 7000 CPUs

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.

Areej Syed

Processors, PC gaming, and the past. I have written about computer hardware for over seven years with over 5000 published articles. I started during engineering college and haven't stopped since. On the side, I play RPGs like Baldur's Gate, Dragon Age, Mass Effect, Divinity, and Fallout. Contact: areejs12@hardwaretimes.com.
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