>The MDF file is not approaching the the 10GB limit yet, but eventually it will. This is not my question. I am talking about the system RAM and the utilization of system RAM with SQL Server express and the effect on performance by purchasing a license.
>
>MDF files size is it ?

The SQL Server performance is affected by the ratio RAMSize/DBFSize.
More ratio is lower 1 and more you have a performance degradation.
Then Express is good with small DBF.