We get error messages on our NW-server 6.5 SP5. We seem to get one of these messages per day:

15/10/2008 1.51.30 : SERVER-5.70-0 [nmID=6001D]
Cache memory allocator out of available memory.

Also today another message was reported once:

15/10/2008 10.01.43 : SERVER-5.70-820 [nmID=120001]
Average Page In Rate Threshold Exceeded
threshold: 2000
rate: 2058

Sorry to say I'm no NW-spesialist so I wonder what might cause these errors, and what I need to do.