Intel Desktop Board 21 B6 E1 E2 Manual Online

Based on the model number sequence provided (21 B6 E1 E2), this corresponds to the Intel Desktop Board DZ77RE-75K (part of the Intel 7 Series chipset boards, specifically the Z77 Express Chipset).

Critical note on Drivers

The manual will direct you to downloadcenter.intel.com, but Intel removed legacy drivers. You need third-party archives for: Intel Desktop Board 21 B6 E1 E2 Manual

6 x USB 3.0 ports
6 x USB 2.0 ports

This board is a Micro-ATX (mATX) or ATX form factor motherboard designed for 2nd and 3rd Generation Intel Core processors. It is typically built on the Intel 6-series chipset (such as H61 or B65) and serves as a legacy platform for Windows 7 and Windows 10 systems. 2. Hardware Specifications Intel desktop board - Linus Tech Tips Based on the model number sequence provided (

For more information on the Intel Desktop Board 21 B6 E1 E2, visit the Intel website or consult the following resources: 6 x USB 3

6. Expansion Slots

Two PCI Express 3.0 x16 connectors.
One PCI Express 2.0 x4 connector (in a x16 slot form factor).
Two PCI Express 2.0 x1 connectors.
Two legacy PCI connectors.