Which PCIe Slot is best for your Graphics Card?

Pci Slot - pci e slot This platform provides you with a compact 4u, 500mm deep rack mountable environment for twenty full sized PCIe cards With high power density and optimized pciex16 slot This powerful CPU card and x16 PCI-E available to all 20 slots unleash the unprecedented performance in a very compact 19″ form factor with only 4U

pcie x16 expansion slot PCI-X is generally backward-compatible with most cards based on the PCI or later standard, meaning that, a PCI-X card can be installed in a PCI slot,