SQL instance limiting memory

We hare having issues with some small businesses running server 2008 with SQL.  The SQL instances eat all available memory after a few days of heavy use.

In management studio, should we limit the instance or buy more ram?  Currently we have 8 gig of ram.  SQL is using 2-3 gigs per instance and the servers begin to crawl until we reboot them.

if limiting the instance is the route to take... any particular size anyone can recommend?  most these are small business offices with maybe 10 users.
calljkAsked:
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dodge20Connect With a Mentor Commented:
Yes, you should always limit the amount of memory sql uses.
To determine how much - I estimate how much the OS needs then add about 1GB to that. I give the rest to SQL (assuming there isn't anything else running on the box).

SQL will try to cache a lot of information into memory. It will release memory when needed, but that is a slow process and it is best to leave the OS all the memory it needs.
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