Hi @rbxlio ,

Check out page 8 of T5600 Technical Guidebook and see how memory be sitting correctly. 4x8GB RAM could only works with a single CPU.

Hello bmcowboy

thanks to your interest for my anwser.

I think you don't understand the issue.

You've made a mistake with your anwser : 4 memories sticks work well with 2 cpu, even 2 memories sticks.

Let us suppose that you say the truth, why computer report 0 GB ?

That is my question.

It's first time i'm seeing this  

whether or not I put the memory in slot 2 or 4 of CPU 2, that report 0 GB.

regards

I am also experiencing this issue. I had my T5610 with A06 BIOS with 128GB of Dell approved memory. All was good until I updated to A19 BIOS in December 2019. Only 64GB of the memory is now showing up and CPU2 memory is also not showing up. This memory has been thoroughly tested via MemTest86 and all works fine. Its the motherboard BIOS. I also attempted to downgrade to various previous BIOS revisions but the problem will not correct itself. I also refreshed the CMOS battery thinking maybe that was it but memory still won't popululate in BIOS nor Windows 10 PRO OS.

I have 8x 16GB ECC Dell 14600 Hynix certified memory modules. All was working great for years until I updated to A19 BIOS. Dell....you have a problem with you BIOS.

Please respond -

@rbxlio 

I have the same problem with my T5610.

If you find a solution please share.

I have this EXACT problem. I was on A06 with 128GB of Memory working perfectly then updated to A19 and now it only shows 64GB of memory. All Dell Certified memory from Dell. Was working perfectly for a couple years until we updated.

Dell - Please fix this!

I have the same problem on the same DIMMs, could someone fix it?

Same problem here: Dell T5610 updated to BIOS A19 and BOOM, CPU2 memory is no longer recognized and machine wont boot anymore. Dell, maybe release BIOS A20 to fix this?

You all probably need to go direct to Dell Business support. It's looking pretty obvious that the Update is causing this Perhaps you can. Ok, I'm assuming you all are talking about a BIOS update that has caused this. If so you should be able to download the previous BIOS Upgrade and Install it that should fix the Issue?

I'm not exactly sure about your models but on mine, in the BIOS itself, there is a Feature to install an older BIOS.

Well, machine was no longer under warranty and we actually weren't entirely certain what was causing this: It is clearly related to the BIOS update, but it is equally clear that not all T5610 users have this problem, else this post would have gotten much more attention. So, maybe it is related to the BIOS version we upgraded from?

In any case, we finally managed to get the T5610 to recognize CPU2 memory by downgrading to lower version BIOS's and then step wise upgrading to A19 again. (I cant tell you precisely when it started working as we down/upgraded the BIOS using one CPU, and only every now then we re-installed the 2nd CPU to see whether it was working again... but in the end it worked).

We do still have the Reliable Memory Technology error notifications on boot, with the RMT logs showing..

  Dimm string 9     Dimm slot 9 empty 
  Dimm string 10   Dimm slot 10 empty
  Dimm string 11   Dimm slot 11 empty
  Dimm string 12   Dimm slot 12 empty

..which makes no sense to me, but after swapping memory with another machine and no memory diagnostics being able to find a single bit error (no pun intended), we just switched off RMT in the BIOS and now the machine works like a charm again.

I think most of us got this. Went from A16 to A19 and bam - half my memory gone. 

I've tried going down versions of the bios - but its just undetected. Even tried removing the processor and re-adding it to trigger the bios to pick up the memory.