X99 OC Formula 3.1 - cannot use all RAM slots
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=20072
Printed Date: 23 Jul 2025 at 12:13am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: X99 OC Formula 3.1 - cannot use all RAM slots
Posted By: ChrisKL
Subject: X99 OC Formula 3.1 - cannot use all RAM slots
Date Posted: 08 Jan 2022 at 6:00am
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I have a strange issue. I was running this fine with 4 x 8GB RAM sticks in A1, B1, C1, D1 Bought 4 more identical RAM sticks, I tested them, rotated them to make sure they all work fine and the configuration only works if I use 6 RAM sticks in A1, B1, C1, D1, A2, B2. (48GB in Quad mode) If i put the last 2 in C2 and D2 the screen remains black, no error beeps, nothing, and it never posts/boots. So the question is, has anyone managed to use all 8 RAM slots on X99 OC Formula 3.1 ? |
Replies:
Posted By: Xaltar
Date Posted: 08 Jan 2022 at 6:12am
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Do C2 and D2 work when you have fewer slots populated? If not, try reseating your CPU, it may not be making proper contact and causing those two channels to not be properly connected. ------------- 
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Posted By: ChrisKL
Date Posted: 08 Jan 2022 at 9:09am
| This all has been working fine for the last 6 years with 32 GB (not in the 2 affected slots). Just thought i'd give it more RAM. Do you think it would have function properly this long if the CPU was not sat properly? Willing to re-sit ... but is such a pain and mess to get to it :( |
Posted By: Xaltar
Date Posted: 08 Jan 2022 at 4:24pm
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If slots C2 and D2 have not been in use the entire time you never would have known it wasn't seated properly. It's also possible for the mounting pressure on the CPU to slowly cause a corner to lift (if uneven). Generally with HEDT systems my first stop when diagnosing missing/faulty memory channels is to reseat the CPU. They are so large they have a lot of real estate on the contact area to potentially not be making proper contact. -------------
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