Normal
Some very small and versatile risers can be found at https://riser.maxcloudon.com/en/10-bifurcated-risersThe Delock 89030 is even smaller but it's a very costly solution.Also notable are two surprisingly cheap cards providing bifurcation by using a PCIe switch ie no BIOS support required: ANU24PE08 / ANU28PE16 are 63/112 USD and gives 4/8 SFF-8643 from an x8/x16 slot.Both the Delock and the Ceacent cards need PCIe adapters from some SFF cable, they are just the bifurcation hosts.
Some very small and versatile risers can be found at https://riser.maxcloudon.com/en/10-bifurcated-risers
The Delock 89030 is even smaller but it's a very costly solution.
Also notable are two surprisingly cheap cards providing bifurcation by using a PCIe switch ie no BIOS support required: ANU24PE08 / ANU28PE16 are 63/112 USD and gives 4/8 SFF-8643 from an x8/x16 slot.
Both the Delock and the Ceacent cards need PCIe adapters from some SFF cable, they are just the bifurcation hosts.