That cheap used HP server memory that is talked about in this post works great in the Z600 version 2 and is ECC/buffered. I took that same processor and memory back to the Z600 version 2 and they worked perfectly together again. So, there is another factor on the Z400 version 2 motherboard that kept the HP ECC buffered memory from working. The processor (X5675) worked fine in the Z400 version 2 but the ECC buffered memory that was official for the Z600 version 2 would not work in that Z400. So, I thought that if I could take a nice processor from a version 2 Z600 and get it to work in a version 2 Z400 then I'd be able to run ECC buffered HP memory that worked in the Z600 version 2 also in a Z400 version 2.

The 'memory controller' for these workstations supposedly is on the processor. It is the Z600 version 2 that can officially shift on over to include ECC buffered in addition to still being certified to use ECC unbuffered.ģ. The version 2 Z400 and Z600 HP recommended memory is all ECC also, and the Z400 version 2 still is supposed to stick with unbuffered memory. The version 1 Z400 and Z600 HP recommended memory was all ECC and all unbuffered.Ģ. Memory is not something I want any uncertainty about so I go by the book on this:ġ. Here is my 4/19 up-to-date understanding, and please know that I try very much to go by what HP recommends for memory on these workstations.

Business PCs, Workstations and Point of Sale SystemsĮDIT: I have to retract what I posted below.

Printer Wireless, Networking & Internet.

DesignJet, Large Format Printers & Digital Press.

Printing Errors or Lights & Stuck Print Jobs.

Notebook Hardware and Upgrade Questions.

What does non ecc memory mean