What motherboard can support dual RTX 4090 GPUs?

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The ASUS GeForce RTX 4060 Ti DUAL SSD has an on-board slot, which has been used to run a GeForce RTX 4090 as an external graphics card

It says dual 4090's in the topic but I'm after have a build that I can extend to 2 GPU's should the need arise I have researched quiet a bit  x x ; Slot Box Dimensions x x 2 Minimum is based on a PC configured with a Ryzen 9 5900X processor Power

mponusa slot HDMI, 3x DisplayPort Multi Monitor: 4 HDCP: Display RTX4090 Expansion Slots: 3-Slot Features Similar Products No related Here is the issue From what I understand if I plug a gen 5 drive and a 4090 GPU in the primary slots they will share PCI lanes which