does this require bios support for 4x4x4x4 bifurcation? my motherboard only supports 4x4.

Yes, the product requires SPLIT PCIe BIOS, which implies it needs BIOS support for bifurcation.

Questions & Answers: Linkreal 4 Port PCIe 4.0 x16 to M.2 NVMe Adapter PCIe Bifurcation with Heatsink for PC Gaming Support M.2 NVMe SSD in Size 2230, 2242, 2260 and 2280 (SSD not included)

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Linkreal 4 Port PCIe 4.0 x16 to M.2 NVMe Adapter PCIe Bifurcation with Heatsink for PC Gaming Support M.2 NVMe SSD in Size 2230, 2242, 2260 and 2280 (SSD not included)

Need SPLIT PCIe BIOS
PCIe M.2 NVME Adapter with Heat Sink
Supports PCIe M.2 NVMe SSDs
Only for M key M.2 PCIe NVMe SSD
Equipped with a full-profile bracket and includes a half-height for installation in small form-factor computers

$58^.00 –