Question Overclocking DDR4 Ram causes system not to boot

[andy0x2a]

Hi,

I am fairly new at this, so I would appreciate it if someone could point out what I am doing wrong here.

I bought some cheap ram from new amazon/corsair, which claims it is samsung b-die.
https://www.amazon.ca/dp/B0134EW44S it is CMK32GX4M2A2666C16 Corsair 32GB dual ranked 2666Mhz ram.

I am getting the proper speeds when I enable XMP in my bios, and that works fine.
However, when I went to tighten my timings, according to the 1usmus DRAM calculator, my system does not boot up.

Here are the steps I took to cause the issue:

• Boot into Bios, XMP is enabled and system runs fine at 2666Mhz
• Adust the memory timings for all the values I can see based on DRAM calculator for Ryzen (using SAFE settings)
• Adjust the DRAM voltage to 1.32, based on DRAM calculator (using SAFE settings)
• set the fclk frequency to 2666/2 -> 1333 instead of auto
• Save and reboot

The computer refuses to boot up, after waiting 90s. I then power it off, and clear my CMOS with the JBAT1 jumber.
My system is back to normal, and I can re-enable XMP, after that.


Specs:

Corsair LPX CMK32GX4M2A2666C16 32Gb (2x16 @ 2666Mhz)
Ryzen 7 3800X + stock Wraith Prism
MSI x570-A PRO motherboard
Gigabyte rx 570 graphics
850W PSU

So my question is, what am I doing wrong, and how can I tighten my ram timing (or increase my ram frequency)


More info on RAM specs

 

[cin19]

So my question is, what am I doing wrong, and how can I tighten my ram timing (or increase my ram frequency)

Read more about the RAM oc guide from online, then try again.
I added two of them, you should try to find more.

Understanding RAM Timings | Hardware Secrets

www.hardwaresecrets.com

AMD Ryzen Memory Tweaking & Overclocking Guide

Memory overclocking has a significant impact on performance of AMD Ryzen-powered machines, but the alleged complexity of memory tweaking on this platform, largely fueled by misinformation and lack of documentation, has kept some enthusiasts away from it. We want to change this.

www.techpowerup.com