Advanced Micro Devices Inc (AMD)

[mas]

Performs as well as a similarly clocked Xeon so we are talking about 40-50% of top x86 performance which maybe more than what you are getting now from your current oldish x86 servers .

http://www.realworldtech.com/page.cfm?ArticleID=RWT122803224105&p=8

http://www.microarch.org/micro36/html/pdf/goldenberg-IA32ExecutionLayer.pdf