4x DDR5 modules with Intel

[SkyTerran]

I have an ASUS Prime Z790M-PLUS motherboard and a DOMINATOR TITANIUM First Edition 64GB (2x32GB) DDR5 DRAM 6600MT/s CL32 Intel XMP Memory Kit. It works fine. I recently bought a CORSAIR DOMINATOR TITANIUM RGB DDR5 RAM 48GB (2x24GB) DDR5 6000MHz CL30 Intel XMP iCUE Compatible Computer Memory (CMP48GX5M2B6000C30W) kit. Now each of the kits works fine, but when I put all 4 modules together I get no boot. Even after BIOS reset, so the memory speed is 4800MHz. The CPU is I7 14700F. Any idea how to fix this? The chips on all modules are SK Hynix.

I guess I can return the 48GB kit and order the same kit as the other memory - wonder if that would help.

I have put them in pairs - 24GB/32GB/24GB/32GB.

 

[Tetras]

I guess I can return the 48GB kit and order the same kit as the other memory - wonder if that would help.

Would be better to dump all and buy 64GBx2 or 48GBx2.

I have an ASUS Prime Z790M-PLUS motherboard

What date is the BIOS from?

Now each of the kits works fine, but when I put all 4 modules together I get no boot. Even after BIOS reset, so the memory speed is 4800MHz. The CPU is I7 14700F. Any idea how to fix this? The chips on all modules are SK Hynix.

How long did you wait?

I have put them in pairs - 24GB/32GB/24GB/32GB.

You could try them 24/24 and 32/32, being in the same channel might make it play better. 32/48GB are different die densities and the 32GB sticks are likely to be dual rank, whereas the 24GB sticks will be single rank.

 

[SkyTerran]

The 32GB modules are dual rank. I'll have to check later the 24GB.

I waited 20 minutes for the boot, I know sometime memory training takes a lot of time on AMD, but I thought Intel is usually faster.

The BIOS is the very latest version on Asus support site, it's from May 2025.

I think I can probably live with just 64GB for now So if I'm unable to get it working I think I'll return the 48GB kit and keep the 64GB.

Interesting that I had no problems at all running 128GB 3600MTs DDR4 on ASUS Prime Z790M-PLUS D4 - DDR5 seems to be less stable in 4x DIMM configurations.

 

[Tetras]

I waited 20 minutes for the boot, I know sometime memory training takes a lot of time on AMD, but I thought Intel is usually faster.

Yeah, I'd have expected it to be figured it out by then.

Interesting that I had no problems at all running 128GB 3600MTs DDR4 on ASUS Prime Z790M-PLUS D4 - DDR5 seems to be less stable in 4x DIMM configurations.

True, though mixing die densities is different to the norm. I suspect you would have at least got the system to boot with 4x32 or 4x24.

The BIOS is the very latest version on Asus support site, it's from May 2025.

Ah, cool.

The only other config I can think of is doing 24GB first, but I'd have expected the slower timings to be on the 32GB sticks.

 

[SkyTerran]

The 24GB modules are single rank. I think you're right - the main problem is mixing single and double rank.

 

[JollyJamma]

The 32GB modules are dual rank. I'll have to check later the 24GB.


Interesting that I had no problems at all running 128GB 3600MTs DDR4 on ASUS Prime Z790M-PLUS D4 - DDR5 seems to be less stable in 4x DIMM configurations.

It's a long story but DDR5 doesn't like 4 DIMM setups. Do not run 4 DIMMs.

DDR4 and DDR5 are very different.

 

[JollyJamma]

kyTerran​

Buildzoid has some RAM buying guides. I'll try link one here. IIRC, 24 and 48 gig M Die DIMMs are the easiest to run and would allow you to run higher capacity at possibly higher speeds but I'll need to verify that as it's been a hot minute since I've looked at RAM.

I'll also link a DDR5 overclocking guide. It'll help you get DDR5 RAM stable.

Also, What motherboard do you have? you're on 14th gen Intel, I'd suggest that you upgrade your BIOS to the latest version if you haven't done so already to avoid any CPU voltage burn out issues.

Edit: The guide

Hynix M-Die overclocking

Another Buildzoid video on 24gig DIMM OC

 

[Tetras]

The 24GB modules are single rank. I think you're right - the main problem is mixing single and double rank.

Personally, I would suspect that the unusual die density is a bigger issue than the mixed ranks. I've seen a fair few DDR5 PCs working with that, but I have never seen a PC mixed like 24/32/24/32.