whats the difference between PCIEX16 & PCIEX4??

pcie x16 slot used for,In the film, Vesper Lynd is an agent of the British Treasury who is assigned to keep an eye on Bond's gambling

MOBO and GPU compatibility warning One additional PCIe x16 slot is needed

pciex16 slot PCIe x16: This is the largest PCIe slot with 16 data lanes PCIe x16 slots are associated with graphics cards and provide the highest bandwidth

xmas joker slot PCIe X16 Cable Graphics Card Support GPUs no more than 140 x 325mm GPU Slot GPU 140×325×25 CPU Maximum Height 88mm GPU Slots GPU