This suggests that Pins 1 and 3 might not be jumpered properly. It may also mean that the older Z170 is not compatible with the GC-Alpine Ridge for whatever reason (but this sounds less plausible).
No! That is a false conclusion.
Here's my Z490 Vision D with (a) built-in TB3 on Bus 0 and (b) flashed GC-Titan Ridge on Bus 2. Pins 1 and 3 of GC-Titan Ridge are jumpered because there's no Thunderbolt header. There are 2 ports on
Bus 0 and another 2 ports on
Bus 2.
There are numerous other user examples in this thread and in other threads on tonymac.
View attachment 484909View attachment 484910