Os version : Windows Server 2003, Enterprise Edition 32-bit AWE enabled.
Sql Server:Microsoft SQL Server 2008 R2 (SP2) - 10.50.4276.0 (Intel X86)
2 node physical cluster.
min memory:2048 Max memory:10240 min memory per query:1024
total RAM: 32GB
Page File Space:3.98 GB
Three months back we go this issue "There is insufficient system memory in resource pool 'internal' to run this query" we have max server memory as 12 GB then and from the reference of the link we had changed it to 10 gb http://social.technet.microsoft.com/Forums/sqlserver/en-US/60d20f7a-8d64-48b1-ade9-8ba648e5945c/there-is-insufficient-system-memory-in-resource-pool-default-to-run-this-query?forum=sqldatabaseengine
and now it is repeatedly occuring every week.