Atermiter D4 DDR4 Motherboard Set with Xeon E5 2667 V3 LGA2011-3 CPU 4pcs X 8GB = 32GB 3200MHz DDR4 PC4 REG ECC RAM Memory - AliExpress
Apple Memory Module 16GB DDR4 2666MHz SO-DIMMS (2x8GB) - Apple
OWC 32GB (2 x 16GB) PC21300 DDR4 2666MHz SO-DIMMs Memory, Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs, (OWC2666DDR4S32P) at Amazon.com