On Tuesday, AMD took the wraps off its latest generation of processors, in the form of the Ryzen 7000 series. The processors also come with the new AM5 platform, where one of the major innovations is support for DDR5-type primary memory. In the past, rumors have circulated about which memory speed will be the most desirable for these, with the frequency of 6,000 MHz claimed to be at the top. This is now confirmed by AMD, with some changes.
On the company’s Discord channel, AMD technical marketing director Robert Hallock talks about memory frequencies for Ryzen 7000 (via Wccftech). He believes that the most desirable frequency is 6,000 MHz – at least from the perspective of balance. This does not necessarily give the absolute highest performance, but it is the best compromise between price, performance and stability.
What AMD is sharing differs from previous Infinity Fabric frequency information. With AM4, it is optimal to achieve maximum frequency on Infinity Fabric, while maintaining a 1:1 ratio between memory and Infinity Fabric. With AM5, this is no longer the case, and users are advised to leave the Infinity Fabric (FCLK) setting on Auto in most cases.
The reason why we say “AUTO:1:1” is now ideal because the FCLK will automatically change depending on what memory speed is in the DIMM slots. There’s no “one size fits all” ideal fabric frequency. For example: JEDEC 5300 fclk goes to 1767, 6000 RAM should go to 2000 fclk. Each memory speed has its own optimal fclk, which is why I’m gently guiding people to not worry about what the fclk is because it’s going to change with RAM speed and the AUTO setting will usually give the most performant result unless you have an astonishing overclocker.
And “get the highest possible fclk” is no longer the rule like it was on AM4. In short. – Robert Hallock, AMD
From AMD’s side, it is proposed that the focus from users be instead placed on the ratio between the frequencies of the primary memory and the processor’s memory controller (UCLK). Here, as before, there is a goal of maintaining a 1:1 ratio. Since Double data rate-memory (DDR) is used, the target for the memory controller becomes half the frequency of the primary memory, or 3,000 MHz in this case.
Read more about the Ryzen 7000 series:
Source: SweClockers by www.sweclockers.com.
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