The E1 and E2 variants of the D21-B6-E1/E2 motherboard are essentially the same, with the only difference being:
There is no official Intel Desktop Board “21 B6 E1 E2.” The string is a composite of PCB revision (21), power stage identifier (B6), and chipset stepping (E1/E2) found on (and possibly DB65AL or DP67BG). intel desktop board 21 b6 e1 e2 specification exclusive
The Intel Desktop Board 21 B6 E1 E2 boasts an impressive array of features and specifications that make it an attractive option for gamers, content creators, and system builders. Some of the key features and specifications include: The E1 and E2 variants of the D21-B6-E1/E2
The Intel Desktop Board 21 B6 E1 E2 is available from a range of retailers, both online and in-store. Pricing varies depending on the retailer and location, but you can expect to pay around $300-$400 for this motherboard. Pricing varies depending on the retailer and location,
Expansion slots differ slightly: the B6 provides one PCIe 2.0 x16, two PCIe 2.0 x1, and one legacy PCI slot. The E1 replaces the PCI slot with an additional PCIe 2.0 x4 slot, while the E2 adds a PCIe 3.0 x16 slot (electrical x8) for dual-GPU configurations in compute-intensive tasks.
: Primarily designed for "Sandy Bridge" (2nd Gen) and "Ivy Bridge" (3rd Gen) CPUs like the Intel Core i5-2300 DDR3 SDRAM