OEM items usually have their manuals supplied on the floppy or CD-ROM that accompanies the item. Retail items - some include additional entertainment software. OEM items will have this software only if we note that it is included in the description of the item. Retail items come with drivers when required. OEM items come with drivers when required.
Retail items come with software that is specific to the use of the item.
For example, if you are getting a ReWritable CD-ROM drive, you need software to copy items. Retail items usually come in multi colored boxes with UPC codes. OEM items come in white or brown boxes of sometimes in plastic bags, no UPC code. If you are buying something in part because the manufacturer is offering a rebate, OEM items are almost never covered in the rebate. We suggest that you go to your local store get a retail item.