Intel Motherboards - X99 Extreme4 does not recognize all 8 RAM sticks

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X99 Extreme4 does not recognize all 8 RAM sticks

Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=2595
Printed Date: 31 Jul 2025 at 9:43am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: X99 Extreme4 does not recognize all 8 RAM sticks

Posted By: lastrogue
Subject: X99 Extreme4 does not recognize all 8 RAM sticks
Date Posted: 05 May 2016 at 5:16am

Background:

I have recently upgraded my Motherboard, CPU, and RAM. I originally had an issue with this new build where I had no display on boot up of the motherboard, it seemed to post okay but did not display anything on 3 monitors I tried. After several hours of troubleshooting by removing RAM down to one slot in the A1 slot, removing all other non POST essential pieces of hardware and swapping out RAM sticks, I finally found that I could use an older graphics card to see the display and the issue to be an outdated BIOS issue. I flashed to version 3.30 and I had the display working with my newer graphics card.

Issue:

Now a new issue has come up that has me scratching my head. I have 8 slots filled with RAM and only 6 of them are recognized by the BIOS and windows. The BIOS shows it running in triple channel.

The slots that are not recognized are DDR4_D1 and DDR4_D2.

While the BIOS and Windows do not report the RAM is installed in those slots, CPU-Z does report all RAM is present.

Specs:

Motherboard: ASRock ATX DDR4 Motherboard X99 EXTREME4

Processor: Intel Core i7-5820K Haswell-E 6-Core 3.3GHz LGA 2011-v3 140W Desktop Processor BX80648I75820K

Memory: Corsair Vengeance LPX 64GB (8 x 8GB) DDR4 DRAM 2400MHz (PC4-19200) C14 memory kit for DDR4 Systems (CMK64GX4M8A2400C14)

Graphics Card: MSI Radeon R9 390x 8G

PSU: Thermaltake TR2 TR-600 600W ATX12V v2.3 SLI Ready CrossFire Ready Power Supply

Troubleshooting done so far:

Step: swapped memory in unrecognized slots out with known working RAM sticks
Result: With the known working sticks in the slots, the same slots are not recognized (no change)

Step: Increased voltage from 1.250 to 1.300 as a suggestion on another forum
Result: No change

Is there anything else I can do or is it time to return the board?

Replies:

Posted By: lastrogue
Date Posted: 05 May 2016 at 5:17am

I forgot to note that I did return the RAM voltage back to Auto (1.250)

Posted By: lastrogue
Date Posted: 06 May 2016 at 2:59am

After contacting ASRock support they believe it to be a fault with the D channel.

I am going to need to return the motherboard to the seller it seems.

Posted By: Attreyu
Date Posted: 18 Nov 2017 at 10:22pm

" rel="nofollow - I'm encountering the same issue.

I have 4 x 8GB, Corsair cmk16gx4m2a2400c14, 2400.

D1 and D2 channels are not recognised by BIOS, but they are seen in CPU-Z.

BIOS is updated. 6800K i7.

I've tried increasing the voltage, enabling XMP profile, disabling VSID, reseating the CPU cooler, etc.

It's even more strange, because in BIOS, the utility shows the D1 slot being populated with one of the 8GB sticks.

So it's clearly not a hardware problem.

Someone from ASRock can comment ?