Adds one PCI slot for desktop PC with PCI-E slot to use PCI card. Compliant with PCI specification revision 2.3 w/ 32-bit 33Mhz host interface. Compliant with Single-Lane (x1) PCI-Express specification revision 1.0a. Supports 2.5Gbps PCI-E bus with full duplex channel. Support PCI slot 3.3V, 3.3Vaux, 5V and 12V. Provide 4 pin power connector (Support 12V and 5V - must insert with power supply). Operating System: Windows 2000 / NT / Server 2003 / XP / Vista / 7 / Server 2008 / Linux. Please note: 1. As PCI-E & PCI position design are all standard, PCI card is inserted a bit tightly on the adapter. 2. The total height is increased after inserting PCI card, so please check the inner space of you computer case first. 3. The cutout of the bracket is 48mm, so please check the inserted PCI card first, if it has external ports. Package content: 1X Brand New PCI to PCI-E Adapter.