Where to find recent docs about Capacity Planning

Hi to all.
I'm trying to figure out the kind of servers I need for my application.
I have some information about the number of concurrent users and an estimated number of transactions per second that the system expects.
I've been wandering through the documentation trying to find some kind of benchmark that could guide me about how I can estimate the hardware requirements.
I found a very good guide in:
http://e-docs.bea.com/wls/docs81/capplan/capgen.html
but is based on WLS 8.1.
Is there any guide of this sort but with a more recent version of WLS?

Hi Maxence.
Thanks for the reply.
I've just read the page that you post and give some general guidelines.
I guess there is no benchmarks tests already for WLS 10.
Do you think that the formulas in http://e-docs.bea.com/wls/docs81/capplan/capgen.html could hold for some other results?
I mean, if I can take another benchmark results, like SPECweb2005 or SPECjbb*2005 using WLS, exchanging the reference TSPs, the formulas are still valid?

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