Asus X99a not all RAM recognized

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Myx

Commendable
Apr 25, 2016
5
0
1,510
I have seen this problem posted many times in several forums, yet the conditions for this to happen seem to vary. (Not regarding the X99a specifically, but among other Asus Motherboards with the X99 chipset)

My motherboard is an Asus X99a, and I've got 2x DDR4 Kingston Hyperx 2133mhz modules, which it refuses to recognize together.

I have tried the following to no avail:

memtest86 - No problems detected.
Switching both RAM sticks around all the 8 slots, one or the other, or both. - Refuses to detect both when they are inserted, recognizes any given stick individually.
Increasing the RAM frequency - Maximum I have gotten it to has been 2400, any further yields an Overclocking Error (This is important)
Increasing the RAM voltage - Didn't work.
Reseating the processor, checking for bent pins - None detected
Tightening/loosening the cooler - Didn't work
Enabling XMP - Used both the mobo's switch and the BIOS settings, none made a difference.
Updating the BIOS - Didn't work.
Clearing CMOS - Didn't work.

I have gotten the BIOS to recognize RAM in all of the slots individually (e.g., switching around a single RAM stick over the 8 slots, being recognized every time).

There has only been a handful of situations where the BIOS has recognized both sticks at the same time, and that is when I force an Overclocking Error (For example, trying to increase the RAM frequency above 2400mhz), this leads me to believe that there might be some BIOS settings that might solve my problem, as the board IS capable of detecting both given specific circumstances.

Is there any obvious solution I haven't tried yet?, or does anyone else have any ideas as to how to fix this?
Any help for solving this problem would be greatly appreciated.

Thanks in advance.

 
Solution
Tradesman1
May well just don't want to play, what we've done will normally stabilize mixed DRAM but sometimes they just don't play at all. Have run into this too many times :(
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Tradesman1

Tradesman1

Legenda in Aeternum
Jun 5, 2013
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You may simply have two sticks that don't want to play together, always best to get all the DRAM you want in a single package so they have been tested to play nice. Happens all the time. Try raising the DRAM voltage + 0.05 and see if that stabilizes them
 
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M

Myx

Commendable
Apr 25, 2016
5
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1,510


Rising the voltage hasn't worked. I tried increments up to 1.3 after which I got an "Overclocking Error".
 
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M

Myx

Commendable
Apr 25, 2016
5
0
1,510


Very well, I will RMA both memory sticks in order to get a compatible set.
Thank you for your help! :)
 
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O

Obankenobi

Prominent
Mar 11, 2017
1
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510
I was just tearing my hair out dealing with this same deal. I built my X99-A with 4 sticks of 4 GB 2400 RAM. I used A1, B1, C1, D1 (every other slot). When I went to upgrade with 2 sticks of 8 GB RAM, I tried many combinations of slots, but either the RAM wouldn't be recognized, or some of the original RAM would drop out. I finally got every stick to work using this order: 4, 4, 8, 4 [CPU] 4 [empty] 8 [empty]. Does not seem to jive with Asus' RAM priority diagram in their manual.
 
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L

LAMINI

Distinguished
Sep 19, 2009
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To anyone looking for an answer for this issue regarding x99 motherboards not being able to read all your memory slots, my solution was...

- Reset settings (good ol CMOS jumpers). Mine is an ASUS TUF motherboard so I had to use the jumper method as I didnt want to remove the "armor".
- BIOS
-- chose "+" on the memory settings for increasing Voltage. Made no sense at first, but apparently it can only increase a certain amount per increase.
-- I rebooted but no change in symptoms (6 X 8GB sticks of various CL timings). Dropped memory from 2400 to 2000.
Suddenly after a few days of figuring out why my computer could only read 2 sticks at a time were solved immediately by the voltage increase and slowing the memory down.

Thats on a Asus x99 motherboard I got a year ago. I needed more memory as 16gb wasnt cutting it so I picked up another 32GB from Microcenter (needed it "today" issue). Every stick was readable at D1, thats it. I couldnt even go back to original 16gb pair as it would only read 1 stick at a time. Then used that procedure above specifically. I was not going to return that memory (which was a couple times more than last year if I may add!), and wait on ASUS to RMA my board.
 
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