Your options on the Mac for 20Gbps/40Gbps performance are Thunderbolt 3, 4, or 5 ... Adding an NVMe SSD to the CM850 will cost you anywhere from $40 (256GB) to $650 (8TB), with the sweet spot ...

8TB, or 16TB SSD storage M1 Max: Four Thunderbolt 4 ports and two USB-C ports M1 Ultra: Six Thunderbolt 4 ports M2 Max: Four Thunderbolt 4 ports and two USB-C ports M2 Ultra: Six Thunderbolt 4 ...

However, the latest SSDs can also offer up to 8TB of storage ... Another thing to take note of is whether the SSD connects via Thunderbolt 5, 4 or 3, and USB 4 or USB-C, USB 3 or USB 3.2×2.

and going up to $549.99/£538.99 for the 8TB option. Professional users may prefer a faster SSD that has a Thunderbolt interface, but Thunderbolt drives do still tend to be pretty expensive.