Hi Mark,
I have followed your link, but I do wonder whether the maximum capacities quoted actually reflect what Dell will supply rather than compatibility. For instance, here is the link to the equivalent specifications page to the Dell Mobile Workstation which I use for photography (and which ran HW very well for a while until I got the 3640 as a dedicated HW computer):
https://www.dell.com/support/manuals/en ... lang=en-usThis states that the motherboard supports up to 4 PCIe NVMe drives up to 2 TB, though there is a footnote to the effect that one of the slots has a SATA interface. I actually run it quite happily with one 2TB M.2 SATA SSD, two 2TB M.2 NVMe SSD's and one 8TB M.2 NVMe SSD. I have about a quarter of a million photographs in RAW format and they take up a lot of space.
I suppose I could try putting the 8TB SSD from my laptop into the 3640 and see if it is recognised (it isn't a boot drive). The one thing I didn't try with the 4TB drive was putting it in the slot on the riser card, as the drive that I have there at the moment (for my HW cache) isn't visible in the system set-up, so if I put a new drive there I might not be able to install Windows on it in order to boot from it. The simplest solution would probably be to keep my existing 2TB SSD boot drive, get an 8TB drive to put onto the riser card and keep all my HW files on that. That would be more space than I would use in the foreseeable future. However, it would be very expensive (about the same as two Organ Art Media sample sets) and I am not sure that I could justify the outlay. I am going to have to do something soon, however, as I only have about 16GB left on my boot drive and both HW and Windows keep adding more files to it.
I have returned the 4TB WD drive to the vendor and I am waiting for a refund, though they state that they have a policy of deducting 15% if the packaging has been opened, which of course it has. I am not sure of the legality of this, however, at least in the UK.