Match RAM frequency DDR5 with AMD’s Ryzen 7000 series Infinity Fabric clock, this is the new challenge.
If Intel has already partly switched to DDR5 memory with Alder Lake last November, AMD is waiting for the release of the next Ryzen to also make “the big leap”.
DDR5-5600 in “basic” configuration
This leap will logically go through an adaptation of the BIOSes of the X670 motherboards, and it is precisely the analysis of the code of that of a Gigabyte that has made it possible to obtain some interesting information.
You should already know that, initially, the Ryzen 7000 series are to be associated with DDR5-5600. AMD thus goes further than Intel, which opts for DDR5-4800 on Alder Lake and DDR5-5200 on Raptor Lake.
An association for which we can count on EXPO (Extended Profiles for Overclocking). This technique, which is AMD’s response to Intel’s XMP 3.0, has been confirmed by the Gigabyte BIOS.
This BIOS confirms the existence of two profiles via EXPO. The first is focused on bandwidth, while the second focuses on latency and the maximum frequency of the Infinity Fabric, 3000 MHz.
Maintain a 1:1 FCLK:MCLK ratio
Recall that the Infinity Fabric (FCLK) is one of three clocks on a Ryzen configuration. It manages the speed of communication between the CPU cores, while the Memory Controller (UCLK) manages exchanges with the RAM, and the Memory Clock (MCLK) manages the RAM itself.
To believe WCCFTech, using DDR5-6000 would result in the implementation of a 1:1 ratio with the frequency of the Infinity Fabric. We would then benefit from maximum optimization, a ” sweet spot » for our colleagues who evoke the precedents of the Ryzen 3000 and 5000.
- AMD Ryzen 3000 Zen 2″ sweet spot » : DDR4-3800
- AMD Ryzen 5000 Zen 3″ sweet spot » : DDR4-4000
- AMD Ryzen 7000 Zen 4″ sweet spot » : DDR5-6000
DDR5-6000 like this Corsair Vengeance CL36 that we just tested would be ideal. Beyond that, the system would be forced to use a ratio of 1:2 which would logically lead to a drop in performance that could not, it seems, compensate for the faster memory.
Note, however, that this accuracy has not yet been confirmed by specific tests. It will be necessary to check, at the time of the availability of the Ryzen 7000 processors, if this theory is confirmed… provided, of course, that we have DDR5 fast enough for that.
Source : WCCFTech
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