Hi

Correct, you need the 3x8 pin streamer cable! 😊
Have fun upgrading!

Hoi,

Please note that this is the 24-pin power connector for the mainboard.
For the 7900 XTX you need the triple (3x) 8-pin PCI-E strimmer instead. That would be this one:
Lian-Li Strimer Plus V2 Triple 8-Pin (RGB)

Part number 20829909, I also ordered it yesterday and it should arrive tomorrow (for the RX 9070 XT).