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4 Ram Slots Asus Motherboard Problems

Level 8

I'm trying to get 4 ram slots to work on my Asus motherboard (Asus ROG Strix Z790-E Gaming Wifi). But I'm having problems with getting more than 2 ram sticks to work.

First off, I noticed that two ram sticks won't work until I use 1 ram stick and turn on my PC. Then two ram sticks will work after that. This is constant I've noticed throughout the PC if I end up not being able to turn it on after sticking more ram sticks.

I was able to get three ram sticks working after a long bootup (amazingly the third ram was in the b2 slot, which I'm sure is the wrong spot), then I tried four ram sticks but it didn't work. Then after that apparently I had to start over using one ram stick to get two ram sticks to work again.

I was able to determine one of my four ram sticks was faulty. Another one of my ram sticks sometimes work and doesn't. So I tried using a different ram stick of a different speed.

My PC turned on with three ram sticks using 2 of the same speed sticks, and one different speed stick. BIOS would only show the new ram stick with a different speed as an option to enable under DOHP. Which when enabled using that wouldn't boot my PC.

The pins on my ram slots look fine, and all four slots look identical as well. So I'm sure there's no bending of pins on my ram slots. My CPU is i9-13900 which supports 128 gb of ram, and I'm using ram sticks of 32gb each. My ram stick is the G.Skill Trident CL-30-40-40-96 32gb which is compatible with my motherboard.

My Dram voltage is set to auto which is 1.4 V (1.395 actual number used I remember reading in BIOS when PC is used) and has no option to be changed. I don't see an option to change my SOC boot voltage in BIOS, and searching SOC in my bios gives no options to change the SOC boot voltage.

I'm going to stick in my first ram in the A2 slot, the second ram in the B2 slot, the third ram in the A1 slot, and the fourth ram in the B1 slot. This should be the correct configuration for my motherboard. I'm able to return the new faulty ram sticks, and get new ones later.

What do I need to do to get four ram sticks working? I've heard Asus motherboards need to learn when sticking in ram, so will four ram sticks work after getting two ram sticks to work? Do I need to get three ram sticks to work first? Why can't I get four ram slots to work?




Level 14

Is your memory on the Strix Z790-E Gaming Wifi Memory QVL, and listed as "1,2,4" in the socket support column?  Looking at the QVL, I don't see any listing for a 4 DIMM config using 32GB G.SKILL DIMMs.

You can't just mix and match different RAM sticks and expect a good result.  Additionally, getting 4 identical sticks to work can be more difficult than 2 identical sticks, particularly when overclocking (all XMP/DOCP/EXPO/etc is overclocking).  Higher density RAM is also harder to overclock (i.e. 32GB sticks are more difficult than 16GB sticks).

I didn't know there was a memory QVL thing Asus tested. Thanks for telling me about this. It looks like my memory kit only has a 1,2 listed in the socket support column. So maybe my motherboard won't work with 4 of them installed.

I was able to get three of the same ram sticks later working amazingly with one of the faulty ram sticks that sometimes work, and with it being inserted into the B1 slot. But the computer booted unusually slow. Right now I have two of the same ram sticks inserted into my motherboard.

I already ordered my two new ram sticks and it's set to come in tomorrow so I should be able to test if I can get 4 ram sticks working. If that even a possibility with my motherboard.

I'll report my results tomorrow.

Super Moderator

As Murph has stated please confirm your memory kit part number. Combining or mixing kits is not recommended. 

SOC voltage is for AMD platforms. Your key controller voltages for Intel and DDR5 are CPU System Agent and Memory Controller Voltage under Extreme Tweaker and Advanced Memory Voltages respectively. VDIMM options are VDD for data portion and VDDQ for power respectively.

Remove one kit and report back with the memory kit part number.

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

The memory part kit number is: F5-6000J3040G32GX2-TZ5NR

The exact memory kit used can be found on Amazon in this link:

I'll take a better look at the key voltage options when I get the chance, because I'm not at home at the moment. I do remember seeing the VDD and VDDQ options in the BIOS and I wasn't able to change them, but I'll make sure that's correct when I the chance.

Thanks for the help!

You may need to enable the High Memory Voltage option in order to exceed 1.43v but the value should be adjustable. It's important to keep in mind memory kits are binned by the memory vendor in the density in which they are sold, so combining is not supported by them or by the motherboard vendor.

Tuning the kits manually will be needed and there's only so much guidance one can give when doing so. Hope this helps!

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Sorry for the late reply, I wasn't able to work on my PC until today. I got the 128gb of ram to work.

What I did to get it to work was change the DRAM speed from 6000 to 4800 in the BIOS. My motherboard DIMM speed is set to 4800, so changing may or may not slow down the DRAM speed.

My PC did shut off randomly with the 4 sticks of ram, so maybe my motherboard is not compatible with 4 sticks of the ram I'm using. I might switch back to 2 sticks of ram if that's the case.

Thanks for helping!