Intel Xeon E5-1603
This Xeon is based on the 32nm Sandy Bridge core which makes it a 'second generation' Core processor. Launched in March 2012 and offered a fair deal of performance for a quad-core piece. Sandy Bridge Xeon's are available in 2, 4, 6 and 8 core models. A lot of the Sandy Bridge Xeon's have Hyper-Threading and Turbo enabled but this 1603 has to perform without it.
Higer clocked models where also available, up to 3.6GHz with the quad-core Xeon 1620.