PCI-E PCI Express 16X to 1X Adapter Converter Riser Card Extender Flexible Extension Cable w/ Molex 4 Pin Power Connector Molex 4 pin power connector available for more stable operation for graphic card while mining. Install PCI-E 16X device to PCI-E 1X slot freely according to dimension and position of computer case. Ideal for small computer & server case, like 1U & 2U. One end is PCI-E 16X female and another end is PCI-E 1X male. Please note that there are 2 pins in Molex 4 pin connector.