Controller card is a piece of hardware that acts as an interface between the motherboard and other components of the computer. Most computers have all the necessary controllers built in the motherboard. However, if you add additional components such as a SCSI hard drive, you may need to add a controller card as well. Controller cards are typically installed in one of the computer's PCI slots.It is important that you know the component for which you are buying the controller card. The controller card type attribute in the tech specs section tells you the utility of the controller card listed here. You also need to know the interface type of your computer to determine the compatibility of the card with your system.We recommend that you use the System Drill Down or the Service Tag look up functionality to buy a compatible controller card for your system.Please note that some of our replacement products are provided as kits or assemblies. These kits may contain additional parts required for installation; these parts will be listed separately as 'Component Parts' in the Highlights section of this page. In case a product is not sold as a kit or assembly, it may require complementary parts for ease of installation.Please note that this replacement product is refurbished. Dell provides a warranty of 90 days on all refurbished products.