Extend with 2 USB3.0 20pin connector (can expand 4 USB 3.0 ports) from desktop PC which with one free PCIe slot.PCI-e to Internal 20Pin Male Ports Adapter Super Speed USB 3.0 The superfast USB 3.0 ports will 5Gbps max data() transfer speed for video,audio,photos or files.This PCI to Dual 20 Pin USB 3.0 Card gives you 4 X USB 3.0 ports. So you can plug in your tablets, smartphones, external hard drives, and other devices at the same time . It's also economical - by being to connect so many devices, you save the cost of extra or cards.Thick gold-plated PCI-E interface for more stable transmission. Not prone to data distortion. Applicable slot: For PCI-E X1 X4 X8 X16 slot.System Support: Windows XP / Vista/Windows7/Windows8,Windows8.1,Windows10 etc.Function:through this hub, the governor can supply power to up to 8 fans, and the rotating potentiometer can adjust the speed of 8 PWM fans at the same time.(Note:the fan base supports 3pin and 4Pin fans,If the fan does not support PWM speed regulation function, the speed regulation function is invalid. The current connected to the fan shall not the maximum current value of 17Ato avoid damage to the governor)Installation :the adhesive pad at the bottom of the marshalling governor can be bonded in the chassis for fixation.Supply voltage: DC12V.Power supply interface: 6pin (2*3Pin) interface.Max current: 17ANumber of fan seats: 8PCSsize: 42 x 29 x 20mmMaterial: PCB+Plastic+Metalcolour: blackPackage Contents:10 x Chassis Fan PWM Hub Speed ControllerOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.