RAM OC tRC question (Ryzen 1600)

jeffery7466 · May 8, 2020

Hi LTT community!

This the the rig in question:

Bascially:

Ryzen 1600 @3650MHz, Core VID 1.281V (This is the highest clock speed I could stably get under 1.30V, so no I didn't win the silicone lottery.)

ASUS DUAL GTX 1070 O8G

ASRock Fatal1ty AB350 Gaming-mITX/ ac

Corsair SF450

Silverstone SG13

Now for the RAM:

Corsair CMK16GX4M2B3200C16 2x8GB

I'm trying to OC it to 3200MHz. For timings and voltages, I used 1usmus' Ryzen DRAM calculator v.1.7.0, using the 'Safe' presets.

The recommended (Rec.) values are the settings I used, where applicable.

NOTE: ASRock's BIOS only allows DRAM voltages at increments of 50mV, so I set it at 1.35V, and SOC voltage can only be set as a offset of a fluctuating, automatically adjusted value, so I left it blank (http://forum.asrock.com/forum_posts.asp?TID=5808&title=what-is-the-default-soc-voltageab350-gamingitx-ac).

*I suspected that there is an error by 1usmus, as it recommended tRC of 42. I've read that tRC >= tRP + tRAS, so it should be 48 or above.

Here is my question. I cannot for the life of me use a tRC of 48. In fact, set it anything below 56 it just simply won't POST, it won't even do a boot loop.

Is there anything I could change to get tRC lower? I won't want to set the voltage any higher as it only goes in increments of 50mV, and I am not sure if the board could handle that, along with the restricted cooling in this ITX build.

And does a higher value of tRC really matters at all?

BONUS QUESTION:

I've just put in a new NVMe M.2 SSD. And funny enough the system went into a boot loop, and reset my RAM OC settings (but not CPU). After some testing, the new minimum tRC is now 60.

Anyone know why this is the case?

Thanks in advance.