Intel Xeon X7350
Athlon 64 X2 5600+
The 'Tigerton' Xeons are based on the 65nm Core 2 Duo architecture but released on a different socket to work with 4+ socket systems. This way you could buy systems with 4 of these CPU's fitted for a total of 16 cores. An expensive solution but with it's 2.93GHz clock you would get a very fast high-core count server in it's day.
The X7350 was released in September 2007. My engineering sample pre-dates that being made in late March 2007.
