These two DDR5 DIMMS were acquired in a bulk DDR4 purchase. I've attempted to test them in two machines, but neither machine will boot with them installed. I'm assuming they are DEAD. The brand is unclear, but markings on the DIMMS indicate that at least part of the ram is SK Hynix. See pictures for close ups of the DIMMS. I believe each DIMM is 16gb, but cannot say for certain.