How many PCIe lanes are needed for a multi GPU server?

How many PCIe lanes are needed for a multi GPU server? what pcie slot for gpu GEONIX GEFORCE GT 730LP 4GB DDR3 Graphic Card 64bit Dual Slot Multiple Outputs- VGA, HDMI, DVI Support PCI-e2 Profile ZORBES® Graphics Card Bracket, what is an m2 slot 16x is physical slot size, that is capable of wiring up to 16 PCIe lanes, but on your motherboard that slot has only 4 lanes connected to it

what is an m2 slot 2 Slot GPU means it takes up the same space as two PCIe slots slots means the card encroach's on the next PCIe slot down usually preventing that slots use

what is an expansion slot 2 Slot GPU means it takes up the same space as two PCIe slots slots means the card encroach's on the next PCIe slot down usually preventing that slots use Core i7-78xx has a limit of 28 lanes This results in a reduced PCIe lane count to the slots 1 and 4 as shown in the following table: Slot 1 is closest to CPU