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What do you mean with "I changed ram type"? sorry I don't understand. thanks so much.

Thanks so much for the explanation, I will read more about the link you gave me and we will see what to do. It's hard to believe to me because I don't find much info over the internet about it, and I think I'm not the only one with this issue.

I'm sure that AWE is not checked. I'm not in charge of Windows Server, but I'll tell my coworker about the link you post. Thanks a lot. I really can't believe that windows server enterprise behave that way.

thanks so much!! are you sure that the problem is SQL? (you say seems) Sorry but I have a little kwonleage of Windows Server, and I would like to know what is and what does Windows do with cached memory. If I put more RAM, the problem will solve, do you that? or the cached memory will grow without limits. It's big problem for us this "issue" thanks for your help.

Hi all!! and after all, sorry for my english!!! We have a memory problem, that I don't know how to solve. We have a Windows Server 2008 Enterprise with 8 cores and 32Gb of RAM. We assign 20GB to SQL Server, an there is 12 GB free for OS. Basically the problem is that Windows Server is out of memory. For example statistics (we have to restart the server to get it normal again): Total Memory 32GB Used for SQL Server 20GB Cached memory 10GB What means that, the OS use this memory??? Free Memory 512MB !!!!!!!!! I don't know what means Cached Memory for Windows Server, but when we get out of memory the performace of the server is very bad. I ask here becouse, I thinks there would be someone who got the same problem, but i will ask in a windows server forum too. Thanks for all!!! and sorry for my english