[Asterisk-Users] Best CPU (of expansion hardware?) for g.729 enc/dec ?

[Woodoo People .pGa!]

Hi!

What do you think (or benchmarked) what would be the best for g.729 encoding
on a mediagateway running asterisk?
we would plan to encode alaw(g711) to g.729 and probably zap(pri)-alaw to g729

do i have to go for dual opteron instead of xeons?
do 1M cache and 2M cache CPU worth the money?
what about powerPC?

thanks for any ideas
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