a update (unfortunate). I got 2x 1.6tb intel p3605 u.2 NVMe drives a few weeks ago (for another server), and decided to try them in this system / backplane, just to see.
SAME issue as the p3700 (warm boot = OK , cold boot = does not show up).
(as i desribed earlie in the thread, a 960gb HGST u.2 nvme i have in this server, does NOT have , and that remains true).
(not to to bad actually, the rare times i do a cold boot, i just reboot esxi once it comes up, or i do that F11 boot override, then ctrl-alt-del , workaround)