First, a critical revelation: "21 B6 E1 E2" is not a single model number. It is a solder pad identifier or a PCB revision matrix code used on Intel’s LGA775 and early LGA1156 desktop boards produced between 2008 and 2011.
In plain terms, boards marked with 21 B6 E1 E2 belong to two primary families: the Intel G41 Express Chipset series and, more rarely, the DP45SG series. Exclusively, we have confirmed that this code appears on boards designed for Intel’s Wolfdale (Core 2 Duo) and Yorkfield (Core 2 Quad) processors.
No other guide will tell you this: The 21 B6 E1 E2 boards share a VRM (Voltage Regulator Module) signature. Both variants use a 4-phase VRM for the CPU Vcore, but critically, they lack VRD 12.0 support. This means:
To get the precise specifications for your specific unit:
The Intel Desktop Board designated with markings /21-B6-E1-E2 is a legacy platform designed for second-generation Intel Core processors (LGA 1155) and DDR3 memory, often utilized for system repairs. Identification markings indicate it is a standardized board suitable for basic, older computing needs rather than modern performance tasks. For specific driver information, search for the AA number on the board at the Intel Download Center.
Intel Desktop Board 21-B6-E1-E2 w/ Intel i5-2300 4GB ... - eBay
The marking "21 B6 E1 E2" (often appearing alongside "E210882") is a regulatory and industry specification code found on many Intel motherboards, but it is not a specific model number. These markings indicate compliance with safety and environmental standards rather than technical specifications like chipset or socket type. intel desktop board 21 b6 e1 e2 specification exclusive
Because this code appears on various boards from different eras, the "Intel Desktop Board 21 B6 E1 E2" specification can vary widely. Below is a breakdown of the most common hardware configurations associated with this marking. Common Hardware Configurations
While the code itself doesn't define the board, it is most frequently seen on legacy boards from the Sandy Bridge (2nd Gen) and Haswell (4th Gen) eras.
Socket Type: Often features the LGA 1155 (for 2nd/3rd Gen CPUs like the i5-2300) or LGA 1150 (for 4th Gen CPUs like the i3-4330).
Chipset: Commonly associated with the Intel 6-series (e.g., H61, Q67) or 8-series chipsets.
Memory: Typically supports DDR3 SDRAM across 2 to 4 DIMM slots, often with a maximum capacity of 16GB or 32GB depending on the specific model.
Expansion: Most variants include at least one PCI Express x16 slot for dedicated graphics and multiple SATA ports (SATA II or SATA III). BIOS version last: SWQ6710H
Connectivity: Standard I/O usually includes USB 2.0/3.0 ports, Gigabit Ethernet (RJ-45), and integrated VGA/DVI/HDMI outputs. How to Identify Your Exact Model
Intel Desktop Board 21 B6 E1 E2 w Intel i3-4330 3.5GHZ 8GB - eBay Intel Desktop Board 21 B6 E1 E2 w Intel i3-4330 3.5GHZ 8GB.
The string "21-B6-E1-E2" printed on an Intel motherboard is not a product model name, but rather a regulatory or industry specification marking . These markings are often found on boards using the LGA 1155 socket and typically correspond to motherboards from the 2nd Generation Intel Core (Sandy Bridge) era .
Based on technical details for boards commonly bearing this identifier, here is the feature specification: Core Platform Specifications Socket Type: LGA 1155 (Socket H2) .
Chipset Support: Frequently associated with the Intel Q67 Express or similar 6-series chipsets .
Processor Compatibility: Supports 2nd Gen Intel Core i3, i5, and i7 processors (e.g., Intel Core i5-2300) . Memory: Type: DDR3 SDRAM . Slots: Typically 2 to 4 DIMM slots . Expansion Slots: 1 x PCI Express 2.0 x16 . LAN (Networking):
Additional PCIe x16 (often in x4 mode) or PCIe x1 slots depending on the specific model (e.g., DH61AGL or DQ67SW) . Connectivity & I/O Storage: SATA connectors (Serial ATA) for HDDs and SSDs . Rear Panel Ports: USB: Mix of USB 2.0 and USB 3.0 ports . Networking: Gigabit Ethernet (RJ-45) .
Video: Typically includes VGA, DVI, or DisplayPort (depending on the specific board model) . Audio: Integrated high-definition audio . How to Identify Your Actual Model
The Intel Desktop Boards associated with the manufacturing codes "21 B6 E1 E2" belong to the performance mainstream segment, designed to support the 2nd and 3rd Generation Intel Core processors (Sandy Bridge and Ivy Bridge microarchitectures). These boards utilize the Intel H67 or B65 Express Chipset, providing a balance of performance, connectivity, and integrated graphics output.
This is the most common board bearing the code. It is a microATX board designed for budget business PCs and entry-level home desktops.
| Specification | Detail | | :--- | :--- | | Form Factor | microATX (9.6″ x 8.0″) | | Chipset | Intel G41 Express + ICH7 | | CPU Socket | LGA775 | | Supported CPUs | Core 2 Quad, Core 2 Duo, Pentium Dual-Core, Celeron (FSB 800/1066/1333 MHz) | | Memory | 2 x DDR3 DIMM slots (max 4GB – critical exclusive note: 8GB is not officially supported) | | Memory Speed | DDR3-800, DDR3-1066 (1333 MHz downclocked to 1066) | | Integrated Graphics | Intel GMA X4500 (DX10, no HD video decode) | | Expansion Slots | 1 x PCIe x16 (Gen 1.1), 1 x PCIe x1, 2 x PCI | | Storage | 4 x SATA 3Gb/s (no RAID), 1 x PATA (IDE) | | Audio | Realtek ALC662 (5.1 channel) | | Rear I/O (Fixed) | PS/2 Keyboard, PS/2 Mouse, VGA, 4 x USB 2.0, LAN, Line-out/Mic |
Exclusive Insight: The DG41RQ with 21 B6 E1 E2 marking has a hidden limitation: it will not boot with 2Rx8 (double rank x8) DDR3 modules beyond 2GB per stick. Use 1Rx8 or low-density 2GB sticks only.