What's the Difference Going from PCIe to PCIe ?

HighPoint launches PCIe Gen5 x16 NVMe SwitchRAID AIC & Adapter Series; 32x Devices &Up To 960TB per PCIe Slot! PCIe Card Electromechanical

except for CEM slots － Captive channels may use vendor determined validation limits for on-die eye or BER Slot Root Complex Ref Pkg Non-Root Complex Ref

pcie 4 gpu in pcie 3 slot slot the controller is owning If it is a CEM slot, then, it needs & 12V supplies and if it is an Key-EM slot, it needs only

pcie 4 nvme in pcie 3 slot This interposer uses high-speed linear signal redrivers to buffer the system data signals across the interposer between PCIe slot and PCB fingers This design