Why isn't SQL Server 2008 R2 using all available RAM?

We have an analytics database server running SQL 2008 R2 with 192 GB of physical RAM. However, we're noticing that during analytics process, the server only uses around 70 GB, bu开发者_C百科t tempdb swells to 300+ GB. The current Maximum Memory is set to 2147483647 MB. The server is running Windows 2008 R2. Is there a way to make SQL Server use more RAM and less disk-based tempdb?

I figured out what is going on. We're currently using the Standard Edition of SQL Server 2008 R2, which, apparently, can only use a maximum of 64 GB of RAM.

http://msdn.microsoft.com/en-us/library/ms143685.aspx