The Intel Xeon 2.66 was a server/workstation processor with 1 core, launched in November 2002. It is part of the Xeon lineup, using the Prestonia architecture with Socket 604. To further increase overall system performance, up to two Xeon 2.66 CPUs can work together in a multi-processor (SMP) configuration. Xeon 2.66 has 512 KB of L2 cache and operates at 2.66 GHz. Intel is making the Xeon 2.66 on a 130 nm production node using 55 million transistors. The multiplier is locked on Xeon 2.66, which limits its overclocking potential.
With a TDP of 89 W, the Xeon 2.66 consumes a good deal of power, so decent cooling is 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 system, Xeon 2.66 uses a PCI-Express N/A connection. This processor lacks integrated graphics, you might need a graphics card.
Neither SSE3 nor SSE4 instruction sets are supported, which will lead to problems with games not starting.