x99e-itx/ac memory problem

I just built a new system with the x99e-itx/ac motherboard. I am using an E5-2690v3 12 core xeon proc, and 32 gb of G.Skill PC4-17000 (2 each 16 gb sticks) F4-2133C15D-32GVR (an "approved" memory stick from the ASRock web site for this mobo), but for some reason, the system only sees one 16 gb stick. Is there a trick to this, or does this mobo have an issue? Dazed and confused in Djibouti, Africa. 

jdtwoseven wrote: I just built a new system with the x99e-itx/ac motherboard. I am using an E5-2690v3 12 core xeon proc, and 32 gb of G.Skill PC4-17000 (2 each 16 gb sticks) F4-2133C15D-32GVR (an "approved" memory stick from the ASRock web site for this mobo), but for some reason, the system only sees one 16 gb stick. Is there a trick to this, or does this mobo have an issue? Dazed and confused in Djibouti, Africa.

No trick involved, but some work for you unfortunately.

When you say the system only sees one DIMM, in what way?

In the Main UEFI screen, showing only 16GB of memory?

In Tools, System Browser, only one DIMM recognized?

Or in Windows or whatever OS you use, showing only 16GB?

All of these, some of these, or what?

Two procedures for you to try, marked 1 and 2.

1. Have both DIMMs in the board. Start the PC into the UEFI, and go into the OC Tweaker screen, and then the DRAM Configuration.

Check that ALL the memory timing settings are set to Auto.

BCLK should be Auto or 100.00.

Set DRAM Voltage to a bit more than the standard 1.20V, such as 1.25V, which is perfectly safe.

DRAM Frequency should be Auto, or set to 2133.

Way at the bottom page of this screen, find MRC Fast Boot. Set it to Disabled.

Find Memory Test and set it to Enabled. This and the setting above will now enable memory training to occur during POST. POST will be longer because of the training, but this can help with stubborn memory problems. It might take multiple (2 - 3) restarts for memory training to give results.

You can also try adjusting the System Agent Voltage Offset setting in the FIVR Configuration screen. How much is the question. Try 0.050V - 0.10V.

2. If you can identify which DIMM (slot) is being recognized, in A1 or B1, make note of that. Then remove the DIMM that is recognized from that slot and set it aside. Put the unrecognized DIMM in the slot you just removed the other DIMM from. Leave things like that, don't put the other DIMM in yet.

Start the PC and see if it POSTs and the other DIMM is now recognized. If it does, now we know both DIMMs are working, right?

If the other DIMM is not recognized, it seems to be bad. Remove it and put it aside. Take the known good DIMM, and try it in the other DIMM slot.

Start the PC and if that DIMM is recognized, you know both slots are working fine, but you have one bad DIMM. You may need to return the entire set, or at least the one bad DIMM.

But if the other DIMM is recognized in the known good DIMM slot, it seems the other DIMM slot is bad. Put the first good DIMM in the suspect bad slot. If it is not recognized, that really seems to indicate that slot is bad. That could be the board, or bent pins in the CPU socket.

Save checking the CPU socket for bent pins for last, unless you did that when you installed the CPU. Let us know how this works out for you.

You've been Dazed and Confused for so long... I hope that's not true...