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06-29-2022 09:34 AM
I recently purchased a HP Z640 with an e5-2620v3. I loaded up the 4 RAM slots with 128GB (4x32gb of 2400mhz), updated the bios to the latest version available, 0.2.59 A, and loaded Windows 10 x64. All was well.
I just purchased a E5-2697v4 cpu and installed it into the z640. It failed to boot and gave 5 beeps and red LED flashes. That should indicate a memory error. I removed a pair of Dimms from slots and it boots normally. I have a LOT of identical 32GB Dimms so I attempted to isolate a bad one but was unsuccessful. If I switch back to the 2620v3, the memory error goes away, all ram is recognized and it boots normally. I also tried a pair of 16GB Dimms and they cause the same error when installed with this CPU. I am following the slot population order dictated by HP.
I have a second 2697v4 and was going to purchase a CPU riser but don't want to do that until I know why the ram issue is occurring.
06-29-2022 10:20 AM
Welcome to our HP User Forum!
I certainly see no compatibility issues with your Xeon E5-2697 v4 processor: https://cpu-benchmark.org/compare/intel-xeon-e5-2697-v4/intel-xeon-e5-2620-v3/, and, as they would say, it should work just fine.
This may very well be something you already tried, but under "Diagnostics & Support Tools" there is a "Fast Test" (4 minutes) and an "Extensive Test" (+2 hours) as found here: HP Z640 Workstation Troubleshooting | HP® Customer Support.
Speaking of Xeon processor upgrading, you may find this User observation helpful: E5-46xx v4 processors work in the Z440, Z640 and Z840 workst... - HP Support Community - 8234687.
06-29-2022 12:26 PM - edited 06-29-2022 01:46 PM
Thank you for the reply.
I did run the tests with no issues found.
Further investigation seems to point to memory slot 4 specifically as the issue. It works fine with the previous processor and causes a failure to boot with the 2697v4.
All I can think is that there is a bit of contamination in the socket from when I swapped cpu. It seems odd that it only affects a single slot. I will check that and retry.
*** UPDATE ***
I removed the CPU and blew out the socket with compressed air. Nothing much came out. Pins all look ok. Reinstalled the CPU and checked again. Slot 4 still causes the 5 beeps.
The ram is all identical: Hynix 32gb 2Rx4 PC4-2400T-R81-11, HMA84GR7MFR4N-UH. Pulled from the same server that had the 2697v4 chips.
06-29-2022 10:06 PM
keep in mind that on newer systems (like this one) the memory controller resides in the CPU itself
your error may be due to a damaged/failing CPU or a engineering sample (pre retail/OEM release ) CPU
since replacing the new cpu with the original cpu resolves the problem, we can rule out bent pins in the cpu socket
07-01-2022 11:17 AM
Thank you. This is a puzzle then. The cpu was taken from a working but retired blade server. That server was dual-CPU and had 768gb of 32gb ram sticks. It had ram in all 4 banks. I am using the same ram from that system.
I can try the 2nd 2997v4 and see if it has the same behavior.
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