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| p.2 #3 · p.2 #3 · If you were creating a great photo computer, what would it be? |
After you decide which NVMe SSDs you might want, how many graphics cards, USB-3.1C ports, thunderbolt 2 or 3, etc., etc., have a good look at the manual for your preferred motherboard and see which slots are really available for use. Can you actually use all of those accessories, or will they be crippled by a lack of data bandwidth ? A speedy NVMe M.2 SSD card may use the same PCIe data lanes that one of the PCIe card slots wants to use, or that your thunderbolt or usb 3.1c controller wants to use. Just having up to six PCIe slots doesn't mean they're all available all the time, and ditto for M.2 and U.2 slots.
Then consider replacements for upgrades or backups. Chances are that those PCIe or M.2 cards cannot be used in a cloning dock. That aside, if you get one with too little storage capacity you'll be up for an upgrade sooner than otherwise, obviously, but unlike with SATA drives there will be less chance for those replaced items to be useful outside your pc case, and even inside.
In short, all of the really, really fast goodies use a significant portion of the total pc data transfer capability and data connectivity (limited by CPU, graphics and motherboard). The old SATA and USB 2 days were slower but also easier to get along with.