What is PCIe x16 Slot

What is PCIe x16 Slot can you put pcie 4x in 16x slot Both the blue slots are PCIe x16 The difference is that the 2nd PCIe 16x is capable of wiring candy gold slot It looks very simple, just like a extension hub to add 4x pci-e 4x drives to a x16 slot Does this work for most modern servers? For example

candy gold slot I have a pc setup i7 10th gen cpu in an asrock b460 This mb support in 1st pcie 16x, in 2nd pcie slot only 2x and it also has 2 pci-e 1x I have a

can i put pcie x4 in x16 slot You didn't provide 'what' card, some cards work in 16x slot Your 4x slots are PCIe spec bandwidth So Depends on the case and where your PSU is if putting the GPU in the bottom PCIE slot it might reduce airflow to the GPU with it being to close