Dear thebeginning,
Generally retail and OEM products will include the exact same item. However, the retail version may be bundled with additional accessories including but not limited to software, manuals, cables and retail packaging. Occasionally the retail version will accompany a more comprehensive factory warranty so you may want to contact the manufacturer directly for details.
The OEM (Original Equipment Manufacturer) acronym is used to denote equipment that is sold to resellers like Newegg for integration into systems. Also known as white or brown box products, these components are sold in bulk for a discounted price without any special packaging or accessories (except for possibly the necessary drivers), which allows Newegg to pass the savings along to our customers.
Primarily system builders when assembling a new computer, often eliminating the need for cables and manuals since an experienced PC enthusiast will utilize the parts, use OEM items. We recommend that if you have not personally upgraded your PC in the past or if you are a novice at PC repairs to purchase retail products so that you receive all of the available accessories and any additional manufacturer support that is provided in case troubleshooting is required.