2 different Goodram DIMM types, problems with XMP/OC

[spiffles]

I have a problem making my memory run to specifications. I'm using 2 sticks of Goodram Play 8 GB 2400MHZ CL15, and two of its successors: Goodram IRDM (same specs). The mobo is Asrock Fatality Z270 professional gaming.

So it turns out that the older model does support up to 2400 mhz, but only using its XMP profile, while the newer memory works at this frequency out of the box - anyway, I'm getting 2133MHz across the board instead without any tweaks. Changing to the XMP profile in this motherboard's bios is a bit weird and counter-intuitive, but I was able to select the OC profile for 2400 MHz for the entire memory setup. It does work and it speeds up my Cinebench benchmark rather considerably, but it tends to make the computer crash. I haven't been able to make this stable, even though it's well within both the memories' factory capabilities to run at. The voltages I've tried were 1,4v and 1,35v - to compare, non OC-d memory runs at 1.2 and there are no problems. When I tried launching the PC without changing the DRAM voltage, it wouldn't send any signal to the monitor and I had to do a BIOS reset. Digging out that little battery from under my graphics card was no fun to do, I can tell you that.

How would you proceed in this case? Is it feasible to get a stable 2400MHz or even slightly above that? Thanks!

[rEkmAInc1csBnlM6C85H]

It can be difficulty to get XMP stable when you run more than one DIMM per-channel (Compounding tolerance inconsistency between all the parts and such). So you can do the following:

• Run the ram at 2133MHz.
• Crank the voltage even higher and hope for the best, (Double check; but if I recall 1.5V is still safe for DDR4 but you may need extra cooling).
• Run 2 x 16GB DIMMS for near guaranteed stability.

Timing adjustment and all the other RAM OC stuff is beyond me, but someone else may have some ideas how to make that work in your favor.

[spiffles]

21 minutes ago, Andrew 1337 said:

It can be difficulty to get XMP stable when you run more than one DIMM per-channel (Compounding tolerance inconsistency between all the parts and such). So you can do the following:

• Run the ram at 2133MHz.
• Crank the voltage even higher and hope for the best, (Double check; but if I recall 1.5V is still safe for DDR4 but you may need extra cooling).
• Run 2 x 16GB DIMMS for near guaranteed stability.

Timing adjustment and all the other RAM OC stuff is beyond me, but someone else may have some ideas how to make that work in your favor.

Aight thanks, then I'll probably need to just pick up two more newer DIMMS to have all of them matched.