I found these before an online company went out of stock. You probably looking  at the  last 16x2 32GB kit of the tightest timings G Skill has put on ddr4. Those timings on manual can go even tighter non XMO ir DOCP. Selling because I switched to intel z790. These are capable of overclocking to 3800 or more, if you know about timing settings. AMD users : Thier cpu's dont like their memory controller fabric speed being overclocked. I have just had it with PBO  overvolting my 5950x Dead after one year. Second died 4 days after install, 3rd Just a manual oc to 4400@1.12V. Lasted almost 2 years. OC away if your putting them on an intel chipset , there are videos on this set hitting 4000Mhz. They discontinued these 32gb kits a long time ago. Ive seen a few 8x8's but thats just not enough ram for me