amd64 status

[Miguel Miranda]

Hi list, i have heard a lot of good things about opteron servers, im 
going to upgrade several old production servers (thinking on hp dl145 or 
sun v20z, sugestions?), is the amd64 port stable enough to use it on 
production?, what about performance, will i see a plus if i buy opteron 
isntead of  xeons?.
Can you point me to some docs about it?, the archives are very messed up 
on this topic,
thanks

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Miguel