How To Access 8GB RAM on 64-Bit XP

I am new to Flow Simulation. I have a new Dell T7400 with4-core and 8GB RAM running XP. When solving, the CPR runs between25 and 85% while the Memory Usage is only 700,000K to 900,000K.

Why is the memory usage so low? I thought Flow would grab at least6 GB RAM.

Any thoughts?SolidworksFlow Simulation