For DIMM's, would it not be best to use something like these: https://www.utsource.net/itm/p/11652925.html
1K refresh, 50ns 1Mx16 DRAM chips for $1.51 in 100 or more... And new, too.
I've always had good luck with the DRAM chips from utsource. Always arrived in oem packaging, too.