Solved! See below for solution!
I\'m in Excel 2010 connecting to multiple, seperate Access 2010 db\'s from Excel through PivotTable dat
To clear system memory, you can always run something like this:
Sub ClearUndo()
Range("A1").Copy Range("A1")
End Sub
This will clear the undo stack which houses all the updates to your pivot tables, allowing you to undo them, if you do this in-between refershes it may help you keep memory usage in control.
Please dis-regard my previous suggestion as I was thinking of a solution that helped me in Access.