Vengeance LPX compatible with Z270 Pro 4

I have the exact same problem with the z270 extreme 4 the XMP works in single channel but not in dual i moved both sticks to single channel mode.

Dustbag1969 wrote: I used PC Part picker to select some DDR4 memory for my Z270 Pro 4 motherboard.   I purchased 2 x 8Gb Corsair CMK16GX4M2B3200C   Unfortunately if I load the XMP profile it doesn't boot at all. I have tried a range of speeds/timings and the only speed I can boot at is 2133Mhz which is a lot less than the 3200MHz I expected.   Has anyone else used this memory with this motherboard or should I return it and get something else?   Thanks

Sorry you are having this problem. We have seen many users with issues when using XMP profiles with DDR4 memory for some reason. That is common with any manufacture's mother boards.

Some things you can try:

First, clear the BIOS/CMOS. You should do this every time you insert new memory in a board, or move it to different memory slots.

In the DRAM Configuration screen, don't select the XMP profile. Instead, use the DRAM Tweaker feature on that screen. Just check every item in the 3200 list, including voltage. Then Save and Exit the UEFI/BIOS and see if it completes POST.

When using DIMMs of 8GB or larger, it can help to put them in the A1 and B1 slots. At least that is what was recommended in the past. Worth trying.

Find the MRC Fast Boot option at the bottom of the DRAM Configuration screen. Set it to Disabled. That will cause Memory Training to occur, which helps with memory compatibility. If this helps with your memory, leave this option disabled for several starts/restarts. Then try enabling it again, if you like faster PC startups.

I copied the model number (CMK16GX4M2B3200) of your memory into Corsair's Memory Finder tool, and it was not found. That was on Corsair's USA website. I see that model number in the Memory QVL, and searching on that number produces results, so it does exist. Possibly not sold in the USA market?

Dustbag1969 wrote: Thank you for your suggestions.   I have boxed the memory up ready to send back to Amazon but I might try a few of your suggestions and if still no luck send them back on Monday.   One of the suggestions was to switch the memory from Dual channel to Single channel. Could you tell me how I do this and what sort of effect it has on performance?   Thanks

Sure, most boards have two memory channels, marked A and B. Each channel has two slots, so all four slots are marked A1 A2 B1 B2.

Instead of using slots A2 and B2 as we normally do, just put the memory in slots B1 and B2, or A1 and A2. The slots are numbered on the board, or you can check the manual. Nothing to change in the UEFI/BIOS or anywhere else.

In theory, you will get half the memory bandwidth using one channel only, makes sense. What will happen in a test of that should be one half the bandwidth, but I've never tried that myself.

I'm serious about not using the XMP profile, and using the DRAM Tweaker feature instead. I've been doing it that way with DDR4 memory for a while now.

Hi All,

Sometimes a little cpu voltage increase may help.