R620 CPU Upgrade Causing Memory Error

Question

I have an R620 with the following specs.

2xE5-2640 CPU's
64GB RAM (8x8gb)
H200 Raid Controller in PCI slot
2x750w PSU's

Everything is running fine with this setup and I am using this as my homelab as a Hyper-V host for a number of VM's. I wanted to upgrade the CPU's to the E5-2670v2 procs and acquired a matching pair.

When I replaced the CPU's I get the following error: "ddr3 training failure - fpt - write dqdqs dimm a1" and only 48GB of the 64GB are usable (All 64GB shows up in BIOS/iDrac as present).

I have reseated and replaced each of the DIMM's with an exact model and the error persists. None of the CPU pins are bent and I've used compressed air to make sure it's nice and clean. The error completely goes away however when I re-insert the E5-2640's.

I know that the CPU's are compatible as they are listed on Dell's site and I've seen plenty of them out there with this configuration. I've updated the BIOS to v2.7.0 and the Chipset drivers.

Any other ideas?

DELL-Joey C · Answer

Hi CJston15

The troubleshooting that I would start would be removing all DIMMs except A1 and B1 or to bring the system to the minimum memory, which would be a single dimm in slot A1 and single processor. Since the error is stating on dimm a1 slot. If the error clears, I would slowly insert the memory 1 by 1.

Next, is to check what other firmware that have not been updated, eg. LCC.

Krichu · Answer

Hello, Were you able to resolve the issue? I am having the same problem with my R720... Same RAM, CPU 2640 > 2650 V2, bios 2.7... Regards Xtof

PowerEdge Hardware General

R620 CPU Upgrade Causing Memory Error

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