Correction, it's an Irwindale CPU which is in a nutshell the 2nd coming of the Prescott. Irwindale is the Xeon version of the Prescott and included 64-bit extensions. I had said the Northwood CPUs had 64-bit extensions in error. While your CPU could actually have a "Cedar Mill" core, the only major difference is that Cedar Mill was made on a 65nm process and Irwindale was made on a 90nm process (more heat, more power consumption).
Either way, the architecture of the NetBurst CPUs was pretty crap-tastic and is why AMD gained such a competitive edge until Conroe/Penryn (and soon Nehalem, bye bye final Opteron advantage) came out and has mopped the floor with AMDs remains.
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