X99 OC Formula 3.1 - cannot use all RAM slots

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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 ?

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ChrisKL Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 08 Jan 2022 Status: Offline Points: 35	Post Options Post Reply Quote ChrisKL Report Post Thanks(0) Quote Reply Topic: X99 OC Formula 3.1 - cannot use all RAM slots Posted: 08 Jan 2022 at 6:00am
	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 ?

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 22748	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 08 Jan 2022 at 6:12am
	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.


ChrisKL Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 08 Jan 2022 Status: Offline Points: 35	Post Options Post Reply Quote ChrisKL Report Post Thanks(0) Quote Reply 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 :(

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 22748	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 08 Jan 2022 at 4:24pm
	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.