As far as I know, the Microserver requires Unregistered ECC RAM, not the cheaper and more commonplace Registered ECC, which could be why your eBay one didn't work.

Peppery:

As far as I know, the Microserver requires Unregistered ECC RAM, not the cheaper and more commonplace Registered ECC, which could be why your eBay one didn't work.

This of any use?

-Free just pay postage

I recommend using the memory search tool on kingston.com and buying RAM spec'd for the machine.  This has *never* let me down in 15 years of buying Kingston RAM for a multitude of different systems.

If you can't find a local supplier, fire me the part number an I'll price it up for you.

Sorry my Microserver is at a different location than I am so can't see what ram I am using in it. I believe it is DDR3 Unbuffered single-bit ECC ram (as reported). My Microserver came spec'd with 16gb worth.

Yoban:

 

Just done a similar exercise to two HP Microserver Gen8 using the following (Timetec Hynix IC 16GB Kit(2x8GB) DDR3L 1600MHz PC3-12800 Unbuffered ECC 1.35V CL11 2Rx8 Dual Rank 240 Pin UDIMM Server Memory) from Amazon @ $85USD https://www.amazon.com/dp/B00KAGU1X0?ref=ppx_pop_mob_ap_share

 

Both boxes (Unraid and Centos respectively) have been running for about a week with the RAM and no issue and HP System/Bios recognise it without any issues on boot.

 

Did start with Kingston/crucial, but could not find any cheap enough due to server grade RAM and DDR3.

 

edit: added price paid.