https://m.newegg.com/products/N82E16820232736
Has anything tried running these in extreme conditions? This variant seems to have potential, as it's able to boot 4500 cl19 at 1.45v. Certainly not b-die, but Hynix tends to scale with cold very well. It's also very inexpensive.
http://oc.jagatreview.com/2018/07/hands-on-overclocking-review-g-skill-sniperx-ddr4-3600cl19-16gb-kit-2x-8gb/2/