Refresh time for DDR4 memory rows (tRFC)
Refresh time for DDR4 memory rows (tRFC)
I experienced a failure with my RAM module a while ago. It was a 2x16GB unit, and I needed my system up and running immediately. I bought a replacement kit at a good price—also a 2x16GB model. The newer version had 3000MB at speeds of 18-18-18-38 at 1.35V. My old unit was 3200MHz with the same speed and voltage. After getting the old one back from RMA, I decided to keep it too for a 64GB upgrade. Although I don’t currently require that much memory, I thought it wouldn’t hurt. I installed both kits and configured them to run at 3000 MHz with the same voltage. However, I noticed in CPU-Z that the speed is listed as 18-18-38 and the tRFC is 825 clocks. I’m not sure what those numbers mean or how to interpret them. The 825 clocks seem unusual to me. I’m not familiar with tRFC or how it should be set, and my system currently uses Auto mode at 825. Could someone clarify this timing and explain the correct settings?
Nice, another person using a 9600KF might be the Samsung B-die memory. My tRFC was similar, but quite high. I’m not sure how it works across different systems, though I managed to lower mine from 750 to 330. Your B-die performance could differ. The timing feature isn’t clear to me.
tRFC indicates how frequently the RAM is refreshed, a higher setting generally improves performance. Excessively high values cause the RAM to not refresh enough, leading to data loss and crashes. Conversely, too low a value results in frequent refreshes, making the RAM less responsive as the CPU waits for each cycle.
It's naturally due to the four slots and 64GB of RAM. It makes sense why it's handling 2T commands quickly, though it was unexpected not to auto-adjust to 3T...