Activated the XMP profile for 4000 MHz RAM...
Activated the XMP profile for 4000 MHz RAM...
This doesn't look right. Also go ahead and laugh at my CAS 18 RAM. I would like to fix it, however: 1. How do I measure if a different set of settings is giving better performance? I didn't notice any difference at all in cinebench r20 between 2400 and 4000 mhz RAM, AIDA64 gave incorrect numbers for the write test, etc. 2. I tried boosting the fabric clock to 1900 and the memory clock down to 3800. That didn't go so well and I had to reset CMOS. Looks like I need to keep the fabric clock at 1800. So I could try downclocking the memory to 3600 and reducing latency..but how do I know if it is even helping?
2000Mhz is accurate; with double data rate it becomes 4000Mhz. Unless you're really into fine-tuning, keep it as is if it's performing well and stable. Doing RAM overclocking or tweaking latency settings requires significant effort and usually doesn't show much improvement in everyday situations.
The result isn't a perfect 1:1 match with the infinity fabric. The 1800:2000 range indicates inconsistencies, often involving occasional latency delays.
Check for visible changes or effects after applying it. If unsure, test on a small area first to confirm its impact.
You can assess memory latency and bandwidth using AIDA64's benchmarking tools. Synchronizing memory with FCLK typically reduces latency. With an 1800MHz FCLK, expect around 3600MHz (or MT/s) in memory performance. Most Zen 3 chips should handle 1900MHz on the FCLK, which would translate to about 3800MHz in memory.
Great! Likely these are Microv Rev-E or Rev-B models that perform well under load. It was around 3600 CL14 dual-rank, though the latency will naturally be greater on Ryzen compared to Intel due to their differing architectures even with similar memory configurations.