Memory Scan

Hi Guys. I run a Memory Scan from Here.
ORCA COMPUTER MEMORY (RAM), LAPTOP MEMORY (RAM) & PC MEMORY (RAM).
I have Windows XP Home SP3 and Windows7 RC.
My question looking at the results of the Scan,my Computer can use 4 GIG of RAM.
I have 2 GIG installed at the moment.
Would I see a noticeable difference, adding 2 GIG more of Ram?
Thanks.Image may be NSFW.
Clik here to view.

Image may be NSFW.
Clik here to view.