At the heart of the 21 B6 E1 E2 specification is the Intel Celeron 215 processor. This single-core CPU operates at a clock speed of 1.33 GHz with a 533 MHz Front Side Bus (FSB). While these figures seem modest by modern standards, the processor was built on the 65nm Yonah architecture, which offered significantly better performance-per-watt than the preceding NetBurst architecture. The board utilizes the SiS662 Northbridge and SiS964L Southbridge chipset. This partnership provided integrated SiS Mirage 1 graphics, which supported basic 2D and 3D acceleration sufficient for standard office productivity and web browsing.
(e.g., AAD53350-205) is the most reliable way to find specific drivers and BIOS updates on the Intel Support site intel desktop board 21 b6 e1 e2 specification