8 Pack 3600 - 4 memory modules @2400MHz

Littlenose · 24 Nov 2021 at 12:32

I've been trying to add an additional 2 x 16GB memory modules to my original 2 x 16GB modules.

All the memory are the same type:
Team Group 8Pack Edition 32GB (2x16GB) DDR4 PC4-28800C16 3600MHz Dual Channel Kit

It will run fine at 2400MHz, but I can't get them to run at the speciifed 3600.

My system is:
MSI Tomahawk X570 Wifi
Ryzen 9 5900X
Gigabyte 3080Ti

I've had 2 x 16GB modules running happily at 3600 using XMP profile 1 for a while, but when I add the 2 extra modules it defaults back to 2400.

Any help is appreciated.

Minstadave · 24 Nov 2021 at 12:35

You're trying to run 4 dual rank modules which doesn't work well on X570. You often have to back off timings or speeds to get stable.

GregI · 24 Nov 2021 at 12:57

I actually wonder what the issue is here. The board or IMC.

G. Skill's similar spec kit lists almost every X570 board: https://www.gskill.com/qvl/165/326/1562839857/F4-3600C16Q-64GTZN-Qvl

However when you move to the C14 kit not many boards passed: https://www.gskill.com/product/165/326/1620977255/F4-3600C14Q-64GTZNA

The Tomahawk did so we can rule out that. Might be a punt at updating BIOS if you haven't already. I know technically the above kits are sold to work as a set but no reason why the 8Pack kit wouldn't be able to post at 3600 even if memory errors did happen in Windows.

Actually now I think about it you might need to do a CMOS reset. The board might not be retraining secondary and tertiary values and is keeping values from 2 DIMM and not your newly inserted 4 DIMM.

Littlenose · 24 Nov 2021 at 13:07

Cheers for the feedback guys.

The BIOS was updated last week, so should be pretty up to date. Will check.

I'll try the CMOS reset this afternoon and see how that goes too.

Thanks again.

Littlenose · 24 Nov 2021 at 14:33

the BIOS is up to date v1.83

After a CMOS reset, the memory came up as 3600, but during the boot into Win 10, it reverted back to 2400.

Switching off XMP and changing the speed manually in the BIOS, I can boot into 3200 and 3400 fine. Wonder what is the hangup for 3600.

GregI · 24 Nov 2021 at 14:37

Guess it just is slightly too much for the memory controller. You may be close with some voltage changes on the CPU (or RAM for that matter) but not sure.

Littlenose · 24 Nov 2021 at 14:47

Thanks for the time and help you've already provided.
I'm going to live with it for now, and when I get some time, I'll look into what voltages to be considering changing.