Is SQL Server using all my RAM ?

I recently moved a large database to a new brand server with 8GB of
ram.
I didn't notice in the taskmanager it shows, like SQL Server is using
just 2.8GB ... always.
Anytime of the day I see, it says 2.8GB of ram.
Do I need an special parameter or something to tell SQL Server take up
all the rest of the RAM available ? The server is for SQL Server alone.
see
http://www.sql-server-performance.com/awe_memory.asp
"craigkenisston@.hotmail.com" wrote:

> I recently moved a large database to a new brand server with 8GB of
> ram.
> I didn't notice in the taskmanager it shows, like SQL Server is using
> just 2.8GB ... always.
> Anytime of the day I see, it says 2.8GB of ram.
> Do I need an special parameter or something to tell SQL Server take up
> all the rest of the RAM available ? The server is for SQL Server alone.
>