Minor correction needed: "as this is roughly as fast as AMD's Infinity Fabric can operate at with a 1:1 ratio"
This isn't true because memory speed is only related to Zen 4/5's memory controller (UCLK) on the IO die, not the infinity fabric (FCLK). The infinity fabric is even slower which usually runs at 2000MHz. AMD said the preferred ratio of FCLK:UCLK is 1:1 which happens in the so-called 1:2 mode (1 UCLK : MCLK 2) at 8000MT/s. The second best option is to run FCLK:UCLK at 3:2 which is 2000 MHz : 3000 MHz or 2133 MHz : 3200 MHz. This is where the sweetspot of 2000 MHz FCLK and 6000 MT/s came from. If you have a 6400 MT/s memory, you should run your FCLK at 2133 MHz if your CPU can handle it.
"...a CAS latency of 30 clocks, which appears to be the industry's most aggressive timings yet for DDR5-6400 sticks."
Mushkin has been selling DD5 6400 sticks with 30-37-37-96 timings for a while. Now if G.Skill is doing this at less than the 1.4v used by Mushkin then it might be notable.
We’ve updated our terms. By continuing to use the site and/or by logging into your account, you agree to the Site’s updated Terms of Use and Privacy Policy.
Facebook
Twitter
RSS
2 Comments
Back to Article
jerrylzy - Wednesday, August 14, 2024 - link
Minor correction needed: "as this is roughly as fast as AMD's Infinity Fabric can operate at with a 1:1 ratio"This isn't true because memory speed is only related to Zen 4/5's memory controller (UCLK) on the IO die, not the infinity fabric (FCLK). The infinity fabric is even slower which usually runs at 2000MHz. AMD said the preferred ratio of FCLK:UCLK is 1:1 which happens in the so-called 1:2 mode (1 UCLK : MCLK 2) at 8000MT/s. The second best option is to run FCLK:UCLK at 3:2 which is 2000 MHz : 3000 MHz or 2133 MHz : 3200 MHz. This is where the sweetspot of 2000 MHz FCLK and 6000 MT/s came from. If you have a 6400 MT/s memory, you should run your FCLK at 2133 MHz if your CPU can handle it.
FatFlatulentGit - Friday, August 16, 2024 - link
"...a CAS latency of 30 clocks, which appears to be the industry's most aggressive timings yet for DDR5-6400 sticks."Mushkin has been selling DD5 6400 sticks with 30-37-37-96 timings for a while. Now if G.Skill is doing this at less than the 1.4v used by Mushkin then it might be notable.