I pulled these 8 matched DIMM modules (64 GB) from my AI workstation in order to upgrade. They are all working. For clarity, this listing includes all 8 memory modules totalling 64GB.

Note that this kit of 8 matched sticks installs as 1333 MHz memory but has two factory XMP profiles that are factory tested to 1600 CL9-9-9 and 2133 CL11-12-11

Make sure your motherboard can work at these speeds and with XMP profiles. I can only test 1333 and 1600 on my motherboard. No returns on this item. Photo of htop shows the memory operating just prior to removal.

For full details about this very special kit see: https://www.kingston.com/datasheets/KHX21C11T3FK8_64X.pdf

Review here (note the fans are not included in this listing): https://www.overclockers.com/kingston-hyperx-beast-ddr3-2133-64gb-ram-kit-review/