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For windows PCs, the situation is more complicated. There really are no thunderbolt add-in cards for PCs. You need to buy a PC or motherboard with thunderbolt support builtin, which I did not do to my regret now.I have moved everything external to use a Thunderbolt 3/USB4 ports The TB3 ports are as fast if not faster than an internally mounted disk.
https://eshop.macsales.com/shop/thu...rnal-drives#thunderbolt-version:thunderbolt-3
Good to know, but the OP is running a Mac.For windows PCs, the situation is more complicated. There really are no thunderbolt add-in cards for PCs. You need to buy a PC or motherboard with thunderbolt support builtin, which I did not do to my regret now.
USB4 Gen 3×2 is USB-C port only and can deliver 40 Gbits/Sec. Same as TB 3 & 4. It has been available for about 3 years.Check if you can get various flavours of USB 3.1 or 3.2 .
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While 3.2 is not as good as Thunderbolt.... it may be a workable option . and a lot better than waiting for the next upgrade cycle. Native Thunderbolt on motherboards is a fairly recent development, so lots of very recent motherboards will not have the option. Boards to accommodate this need to be designed for higher temp and internal bandwidth.