Does using PCIE x4 make the GPU in PCIE X16 slower?

Can I Connect a x4 PCIe board into an x16 PCIe Slot? - NI slot pcie x4 Except for the most powerful of video cards ? You can do pretty much everything with an x4 slot, and without any adapters, as well Plenty of slot developers DIPCIE2XD01 is PCIe Express Gen 4 SFF-8654 x4 to two PCIe x2 expansion Application with Broadcom MegaRAID 9560-16i, 9560-8i, 9580-8i8e, 9500-16i, 9500-8i,

slot car track scenery PCI Express x4 NVMe Support Rated Maximum Sequential Read 3500 MBps Rated Maximum Sequential Write 3000 MBps Terabytes Written Rating 440 TBW