I currently have an MSI X99S SLI Plus motherboard (5-6 years old) which I’d like to keep, but I’d like to add Thunderbolt 3 connectivity to my PC (mainly for connecting a modern low-latency audio interface).
Can I just buy any X99 compatible expansion board? Are there any downsides compared to a new motherboard with TB3 built-in besides using up a slot? (e.g. stability or latency-wise)