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With SQL Express (either 2005 or 2008 edition) there is a limit of 1GB memory and 1 CPU that can be used. What I’m wondering, is if two instances are installed on the same machine, would they use the same CPU and same 1GB of memory? Or, would they use potentially two different CPU’s and 2GB memory?
The limitations are per-instance. Each instance is limited to its own 1 CPU and 1GB RAM.
You can have up to 16 instances of SQL Server Express Edition on a system.
Also in MSDE, the predecessor to SQL Server Express, the limitations were per-instance.