Question about AsRock B650I Lightning WiFi AM5 mITX HDMI DDR5 retail

Yes, the AXP-90 X47 CPU cooler is compatible.
Ryzen 9 7900x and 7950x 170w cpus are not recommended for this motherboard, they work but not at full capacity.
Take DDR5 EXPO RAM (7200mhz didn't work for me) this one works for me:Corsair Vengeance RGB AMD EXPO (2 x 16GB, 6000 MHz, DDR5 RAM, DIMM)
If you don't see a bios image the first time you start up, you need to remove a RAM strip and reboot, then enable EXPO in the bios.