The "ADD2-N" designation usually refers to a "Dual-Display" capable card that provides a DVI-D output (and often a VGA output via an adapter) for machines like:
Intel 915G, 945G, G31, G33, G45, and similar 2000s-era Intel chipsets. How to Download the Driver dell sil 1364a add2-n card driver download
There are two primary methods to source this driver: the official route (archived) and the compatible legacy route. The "ADD2-N" designation usually refers to a "Dual-Display"
You must install the for your specific Dell OptiPlex model and operating system. The ADD2 card will then automatically be detected as a second monitor output. dell sil 1364a add2-n card driver download