The Intel Xeon 2.8 was a server/workstation processor with 1 core, launched in June 2004. It is part of the Xeon lineup, using the Nocona architecture with Socket 604. Xeon 2.8 has 1 MB of L2 cache and operates at 2.8 GHz. Intel is building the Xeon 2.8 on a 90 nm production process using 155 million transistors. The multiplier is locked on Xeon 2.8, which limits its overclocking capabilities.
With a TDP of 135 W, the Xeon 2.8 consumes a lot of power, so good cooling is definitely needed. ECC memory is supported, too, which is an important capability for mission-critical systems, to avoid data corruption. For communication with other components in the machine, Xeon 2.8 uses a PCI-Express N/A connection. This processor lacks integrated graphics, you might need a graphics card.
The SSE4 instruction set is not supported, which can cause problems with modern games, as they require that capability.