MT18JSF1G72AZ-1G6E1ZF PC3-12800E DDR3 1600 8GB ECC 2RX8

I've used Micron memory products in the past and they never let me down, including this time. And at a very reasonable price. I have an HP Z-230 workstation. It came with 16 gig of memory, and I decided to max it out at 32 gig. Mine came with 2 Samsung PC3-12800 "E" DDR3 modules already installed, so I needed to make sure I got 2 of the same modules, and not the PC3-12800 "U" DDR3 as you don't want to mix E's and U's. Installation took less than 5 minutes, and when I booted up after installing the memory, my Windows 10 system "saw" the added memory (Installed RAM - 32.0 GB, 31.7 GB usable). My system runs much faster now (probably faster than when the system was new and clutter-free). Adding memory is probably the quickest, simplest, and most effective way to dramatically improve the performance of an aging (or even new) computer. You just have to make sure you get the RIGHT memory.

It did it's job and that is all I could expect. Easy to fit and worked perfectly.

Memory installed without a hitch and was recognized as soon as it booted.

works - note "E" on memory specification - this was necessary to fit HP Z420.

Good, I have been using the stuff without any probrems.