Clarrification for SQL Server Express 2008 R2 on CPU limit (CPU based on core based)

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http://serverfault.com – I'm aware that SQL Server Express 2008 is having few limitations on the database size and the CPU utilization. In MSDN documentation it was mentioned on the express edition would use only one CPU. I went through the following links but I'm not clear about this: here and here I have a quad core processor server. If I install SQL Server 2008 express on this server will SQL Server 2008 express uses all four cores or a single core? (HowTos)