1X 2X 4X 8X 16X were compatible (both 1-16X and 16-16X can be used) circuit board PCIe tieline safer more efficient more practical. Features: video card power supply uses three FP solid-state capacitors make graphics more stable for power supply. Riser card with parallel port or 4-pin port power supply reduce the financial burden on the main board. PCI - E 16X video card slot uses original product/pure copper pin connector make graphics contact better. PCI - E connector uses multi-layer shielding wire the longest can meet 3m without attenuation of the signal.