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Originally Posted by musicman691
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I think Cable Matters here is talking about stuff at a super-simplistic level of you just cannot connect Thunderbolt 4 (or 3) directly to Thunderbolt 2 (or 1). But clearly you can for many/most devices with an adapter. Apple sells the Adapter. Where this will not work is where you need PCIe3 bandwidth over the link, which is why you cannot say hang most modern Thunderbolt 3 PCIe/NVMe drives off old Thunderbolt 1 or 2 connections. But you can go the other way. Many simple devices, Audio interfaces etc. just work going through the adapter (sometimes either way). Avid HD Native is only PCIe 1.0 for Pete’s sake… but it’s PCIe card is known to not be properly PCIe compliant, which is the reason for the need to degrade PCIe3 expansion chassis to PCIe2. Who knows how many related alligators there are in that swamp to cause problems, but I any issues will be down to Avid caused problems or possibly bugs in a specific Thunderbolt implementation, or problems with Avid implementing modern DriverKit/user space kdex for this old gear (which they really need to get on independently of solving current problems), not any inherent/fundamental backwards incompatibility between Thunderbolt 4 and 2.