This USB 3.0 PCI Express card offers a convenient update that allows you to add four USB 3.0 ports to the computer using a PCIe slot. It offers two external ports as well as two interior USB 3.0 collectors that allow you to adapt the desktop computer or the server for the support of a series of USB 3.0 devices. Design of the flexible ports and practicers to the additional USB 3.0 motherboard manufacturers offers flexibility to add more USB 3.0 devices interior to the PC. When the existing collectors are busy, it is possible to connect the hubs or the readers of cards on the front panel using this versatile alternative instead of expensive updates to the motherboard and computer. For greater convenience, the card is equipped with two external USB 3.0 ports that allow you to connect more devices such as, for example, external or printed rigid discs. Simple installation and support of old generation of the USB. Install easily and does not require additional drivers or software thanks to the native support of Windows® 8.1/8 operating systems. In addition, it has a double profile design that adapts to standard or low profile houses in order to guarantee compatibility with the reduced -shaped factor system if necessary. The connection of old generation peripherals is not a problem. It is therefore not necessary to purchase new devices as the adapter card is backwards compatible with USB 2.0 and 1.x USB 3.0 efficiently optimized by Uaspquestastastastasta Surnerspeed USB 3.0 at high performance data transfer speed up to 5 Gbps and is optimized with the UASP support support that offers up to 70% faster in reading and up to 40% faster in the Writing than USB. 3.0 Traditional if used with an external box equipped with UASP.PEXUSB3S2EI has a robust structure for reliable connections of USB 3.0 devices and is also equipped with the 2 -year -old Startech.com guarantee as well as free technical support for life. Note: UASP (USB Attached SCSI Protocol) is supported by Windows 8, 8.1, Server 2012 and Linux Kernel 2.6.37 or later. The test results were obtained using an IVY BRIDGE INTEL® system, additional Startech.com USB cards, an external Startech.com box with UASP and a SATA III solid state unit.