Question Intel server MoBo new CPU memory error

Apr 17, 2021
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Hello.

I have some problems upgrading my current MoBo with newer Xeon CPUs.

My previous setup:
MoBo: Intel W2600CR (https://www.intel.com/content/dam/support/us/en/documents/motherboards/server/sb/g34153004_s2600ip_w2600cr_tps_rev151.pdf)
CPU: 2x Xeon E5 2609
RAM: 2X G.skill SNIPER F3-14900CL9D 4GB (https://www.gskill.com/product/165/182/1532504105/F3-14900CL9D-8GBSRSniperDDR3-1866MHz-CL9-10-9-1.50V8GB-(2x4GB))
(populated slots A1 and E1)

I upgraded both CPUs to:
Xeon E5 2609v2

After upgrade, my MoBo won't post and will beep 3 times (3 long beeps). My google skills indicate that this should be a RAM memory problem. The SAME setup works with old CPUs (2x Xeon E52609) and no errors during post.
If I use only single E5 2609v2 then the system normally boots with no post errors. The same happens for the other E5 2609v2 CPU.

What did I already do:
I checked single E5 2609v2 for problems -> all tests pass
I upgraded to newest available BIOS R02.06.0007
I tried multiple RAM slots with no success
I changed RAM sticks

This gives me headaches. How is it possible, that old CPUs work, but newer won't on the same setup, whilst single new CPU normally boots?
 

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