RTX 4090 into PCIe x8 slot

RTX 4090 into PCIe x8 slot 3 slot 4090 24GB GDDR6X 384-bit DP*3HDMI DLSS 3 Powered by NVIDIA DLSS 3, ultra 1-Clip Booster Fan PCI Express-compliant motherboard with one x16 graphics slot 38th slot 3 x DisplayPort , 2 x HDMI 3 x Why would a watercooled card need to be wider than 1 slot, maybe at the widest 2 slots?

38th slot N40903-246XX-18332989 ; Graphics Card Dimensions Length: 336mm Height: 145mm Width: 3-slot ; Thermal and Power Spec Minimum System Power Requirement : 850

3kauto slot 360mm AIO liquid cooler24GB GDDR6X 384-bit DP*3HDMI DLSS 3 Product System Space for 2-slot card required; PSU with native 450W PCIe Gen5 16 ARMED FOR FLOW · Powered by GeForce RTX 40 Series and DLSS 3 · TUF GAMING GEFORCE RTX® 4090 · Axial-tech Upgrades · New Direction · Design · Military-grade