Need Help Stabilizing 64GB (4x16GB) Corsair Dominator Titanium at 6000MT/s on Z790 Hero

[Neo97]

 Hello everyone,

I'm currently using a Z790 Hero motherboard (latest BIOS) with an i9-12900KS CPU. I recently bought a 64GB RAM kit (4x16GB) Corsair Dominator Titanium CL36 with the following specs:

• Speed: 6000MT/s
• Voltage: 1.35V
• Timings: 36-36-36-76

When I leave the BIOS at default settings, the system only detects 4000MT/s. However, when I enable XMP to 6000MT/s, the system sometimes boots, but sometimes it doesn't. Occasionally, after a restart, it just hangs and fails to boot. Even when it does boot, it might run fine for a few hours before randomly restarting or hitting a BSOD.

I'm looking for a way to make this kit stable at 6000MT/s. I really want to use all four sticks. If it can run at 5200MT/s or 5600MT/s instead, that's also fine—I just want to know if it's possible and how to do it.

I'm also considering upgrading to an i9-14900KS if the issue is caused by the CPU.

Any help or advice would be greatly appreciated!

 

[Silent_Scone · Accepted solution]

Hi @Neo97 

4x16 can be a tough configuration depending on the frequency you wish to run. Have you checked to see if the memory kit is on the motherboard QVL for 12th Gen CPUs?

If the system fails to boot occasionally, this is due to failing POST memory stress tests which indicates the overclock stability is conditional.

To alleviate this there's a number of manual tuning options you can use.

1. Relax tCAS by one clock

2. Increase DRAM VDD/VDDQ by 20 to 30mV

3. Relax DRAM frequency to 5600MT/s

Come back and let us know how you get on.

[Neo97]

After adjusting down to 5600 with Timing 38-38-38-78, it was able to Boot up. I tested with Memtest86 and Testmem5 and had no problems.