Users will need a card with a graphics card high-power (GC-HPWR) gold finger in order to build an Advanced ... with Hidden-Connector Design, including ROG Strix GeForce RTX 4090 BTF Edition ...

these graphics cards are offered by companies that have created production lines focused on custom RTX 3090/4090 cards. Some cards have dual-sided PCBs borrowed from the compatible RTX 3090 Ti.