To actually physically connect the burner to the computer. It will need a spare IDE and power connector. These you will probably have inside the computer.
The main disadvantage with OEM peripherals is that there is no software with them. To use the burner on your computer you will need either Roxio or nero burning software, the most commonest. If you visit the burners website it should say what software is used. Or if you post the make and model, we could try.
I bought an OEM DVD burner because I knew it would work on the latest Nero update.