- Staff
- #5,226
The more I read on this the more conflicting and unreliable info I'm getting and I feel like I'm no closer to an answer. I also may just be derp. Just wondering if anyone knows more definitively.
So Zen 3 and previous Ryzen for best memory performance it was best to leave RAM speed coupled with the FCLK in a 1:1. Native FCLK was 1800mhz so 3600mhz memory with tight timings was best. I remember they reported 2000 FCLK/4000 memory being the sweet spot but I read something once that only about 20% could ever achieve.
Now to my point. 1800mhz FCLK is default and 2000mhz meant overclocking your FCLK. For Zen 4 the default FCLK is 1733mhz but AMD have said 6000mhz is the "sweet spot" and for your clocks to be auto:1:1. Some have said based on 1733mhz FCLK at 5200mhz memory that's 2/3:1:1, or 2:3:3 (auto/1733:2600:2600). Is setting the FCLK to auto mean that enabling the DOCP/XMP profile for the memory auto set the clock of the FCLK and that in fact it's ok to now decouple the MCLK and UCLK from the FCLK? Is this how 6000mhz memory with overclock profile set and FCLK set to auto is getting 2000:3000:3000?
What I can't find a definitive answer on is if auto is the XMP profile setting the FCLK or if enabling the profile on say a 6000mhz kit means you have to manually overclock the FLCK to 2000mhz or not.
Hope that makes sense
So Zen 3 and previous Ryzen for best memory performance it was best to leave RAM speed coupled with the FCLK in a 1:1. Native FCLK was 1800mhz so 3600mhz memory with tight timings was best. I remember they reported 2000 FCLK/4000 memory being the sweet spot but I read something once that only about 20% could ever achieve.
Now to my point. 1800mhz FCLK is default and 2000mhz meant overclocking your FCLK. For Zen 4 the default FCLK is 1733mhz but AMD have said 6000mhz is the "sweet spot" and for your clocks to be auto:1:1. Some have said based on 1733mhz FCLK at 5200mhz memory that's 2/3:1:1, or 2:3:3 (auto/1733:2600:2600). Is setting the FCLK to auto mean that enabling the DOCP/XMP profile for the memory auto set the clock of the FCLK and that in fact it's ok to now decouple the MCLK and UCLK from the FCLK? Is this how 6000mhz memory with overclock profile set and FCLK set to auto is getting 2000:3000:3000?
What I can't find a definitive answer on is if auto is the XMP profile setting the FCLK or if enabling the profile on say a 6000mhz kit means you have to manually overclock the FLCK to 2000mhz or not.
Hope that makes sense






Then again I honestly gave up on overclocking when it got more difficult than changing a jumper or a couple of basic BIOS settings, the level of f*ckery vs. performance gains don't really add up for me.



