SSAS and SQL Server optimal settings
There are several whitepapers on optimizing SSAS that you can find on James Serra's blog here - http://www.jamesserra.com/archive/2011/12/top-ssas-white-papers/

I would particularly look at:

The SSAS performance guide in the settings and configuration sections
https://technet.microsoft.com/en-us/library/dd542635(v=sql.100).aspx

and for memory management
http://sqlcat.com/technicalnotes/archive/2008/07/16/running-microsoft-sql-server-2008-analysis-services-on-windows-server-2008-vs-windows-server-2003-and-memory-preallocation-lessons-learned.aspx

I'm not sure what your cost limitations are, but if you're hosting SQL Server Service and the Analysis Service on the same box, I would advise against it if you have fairly large cubes.