Check this thread
https://www-secure.symantec.com/connect/forums/installed-ram
You can view memory data for your inventoried computers in the "Memory Configuration by Computer" report:
1 In the Symantec Management Console, on the "Reports" menu, click "All Reports".
2 In the left pane, under "Reports", expand Discovery and Inventory > Inventory > Cross-platform > Hardware > Memory.
3 In the left pane, under "Memory", click the "Memory Configuration by Computer" report.
You can also view memory data for a selected computer in the Resource Manager. You can see there hardware summary and inventory data for such data class as "Physical Memory" (contains "Memory Type" attribute), for example.
1 To view a computer in the Resource Manager, in the Symantec Management Console, on the "Manage" menu, click "Resource...", select the computer, and then click OK.
2 To view the hardware summary, click Summaries > Hardware Summary.
3 To view the inventory data for the "Physical Memory" data class, click View > Inventory, and then, in the left pane, select the "Physical Memory" data class.