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Memory upgrade problems

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HP Z200 Workstation
Microsoft Windows 10 (64-bit)

Windows 10 Pro 64-bit Version: 18363.836

Intel Core  i5 650@3.20Ghz

System board 0B40h

System BIOS 786H3 v01.22


I recently purchased 4 G.SKILL 4GB memory modules (F3-10600CLD9-8GBNT, DDR3-1333 CL9-9-9-24 1.5v, unbuffered non-ECC) for my HP Z200 Workstation.


With these modules installed and Windows is running, the machine randomly reboots. There is no BSOD and nothing in the event log to indicate that Windows detected a problem.


I tested each module individually with MemTest86+ for at least 10 passes. Then I tested with all four modules installed for 8 passes (which ran for over 16 hours). None of the tests detected any problems with the memory and the machine did not reboot a single time during memory testing.


It seems odd that the reboots only occur when Windows is running. If there was a hardware conflict, I would expect the machine would have rebooted while MemTest86+ was running. My machine  ran MemTest86+ for over 64 hours. The only downtime was when I turned it off to switch out memory modules.


While troubleshooting the issue, I came across the QuickSpecs for HP Z200 Workstation. The only CTO memory configuration listed for 16GB uses ECC modules. And there is not an After Market Option (AMO) for a 16GB configuration. Am I reading this correct? A user can't upgrade the workstation to 16GB? Or, if that is possible, does it require ECC for a 16GB configuration? Why would 4x2GB non-ECC work but 4x4GB non-ECC not work?


While troubleshooting, I also upgraded the BIOS to the most recent release. However, the machine still reboots if I have all four 4GB modules installed and I'm running Windows.


Any thoughts, advice, or explanation?



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There is an issue with the Z200 manual, with the technical information.

Non_ECC modules can be used up to 2GB per slot.   Only ECC modules can be used if 4GB module is used.

Pg 2 is correct, but pg 105 explained the issue.

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Thanks for the clarification.


It is frustrating that HP hasn't corrected the manual and QuickSpecs. I bought this memory off of eBay and the memory is good. The fact that it doesn't work in my machine is neither the seller's fault nor my fault.

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