Zen 3 lets you take better advantage of speeds up to 4000 MHz DDR4
Source: Geeknetic added 06th Nov 2020
by Antonio Delgado Yesterday at 15: 00 …
One of the novelties of the Ryzen 5000 with more interesting Zen 3 architecture, especially for those looking to get the most out of their equipment, is the new relationship between the clock speed of DDR4 memories (MCLK), that of the memory controller (UCLK ), and that of the Infinity Fabric interconnection system (FCLK), which will now be 1: 1: 1 although the RAM memory increased by a certain value.
Currently, with Zen 2, the ratio to the Infinity Fabric clock was 1: 1 until it exceeded 3. 600 MHz, at which time the FCLK speed dropped to a ratio of half and could lead to increased latencies.
Now, with the new Ryzen 4000, the ratio will remain at 1: 1: 1 even if we go above that speed, which means that it is possible to use memories faster than those 3. 800 MHz, either with modules prepared for those speeds or by overclocking.
If we now have DDR4 4 memories. 000 MHz, which would be a speed of 2. 00 MHz being DDR), the memory controller would also work at 2. 000 MHz, and the FCLK of the Infinity Fabric also at those 2. 000 MHz instead of decreasing to 1. 000 MHz as previously.
This means that memories can be used better with speeds per ignition. ima of the 3. 800 MHz or, at least, that there will be no penalty on latencies when increasing above those speeds. According to AMD itself, the memory speed sweet spot in the Ryzen 3000 was at DDR4 – 3800, and now with the Ryzen 5000 will be in DDR4 – 4000.
Happen from 3. 600 MHz to 4. 000 MHz will not represent a significant performance increase
However, in the final performance of the system, as we have seen in our reviews, a performance increase will not be particularly noticeable between going from a few memories of 3. 600 MHz CL 16 to 4 memories. 000 MHz CL 17 for example, so paying the extra cost may not be worth it.
In the end, the s 1: 1: 1 support, which avoids performance penalties when exceeding a certain speed as happened in previous Ryzen generations, but even so, from a certain speed the performance increase is hardly noticeable.
If you haven’t seen them already, don’t miss our analysis of the new Ryzen 5000 with Zen 3 architecture:
- AMD Ryzen 9 5950 X Review.
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