No , you are wrong
This is for all features inside SOA suite including BPM
More in the document passed
Oracle BPM Suite
The Oracle BPM Suite is layered on the Oracle SOA Suite and shares many of the same product components, including: Human Workflow Oracle Adapter Framework for Integration Business Rules
The Oracle BPM Suite provides an integrated environment for developing, administering, and using business applications centered around business processes.
As per other experts...
There is not much difference between hardware configurations for SOA and BPM.
As BPM 11g works on top of SOA 11g. So just we need a bpm extension.
So as a high ens congiguration u need to have minimum 4GB RAM to work with Jdeveloper with SOA and BPM extenions.
It is advisble to have seperate boxes for all SOA, BPM, DB, OSB servers for better performance.
Hope this might help u...
also follow the link for 22.214.171.124 installation process that might anwer your question..