Thanks. (Assuming that is "8 dimms installed" in one z440,) at least that is not as dire as my recollection. Though annoying, it's better than a flat-out F-U (& $pend more$).i've got 8 dimms installed, not sure on the bios version. i have 2 of the 3 z440's updated to the latest bios and they all have the same issue.
And, since you actually bought Barebones Z440(s) from PCSP, did each of those PCSP z440s come with 2 HDD trays? (despite there being no HDDs)
[my z440 was from a different (one-off) reseller; my z4g4 barebones were from PCSP, and did have 2 trays each]