How to increase dedicated graphics memory on X120e?

Hi,
I have 8 gigs of ram sitting in my laptop and was wondering if there's a way to increase the dedicated graphics memory from 384(?)mb to say, 500mb? I cannot find any option to increase the video graphics memory in the bios. 
Any ideas?
Thanks! 

I was about to say it's probably different RAM speeds between the two sticks, but you bought two brand new 4GB sticks in a single kit, right? Hmm, that is puzzling.
Here's a theory: Turn off Virtual Memory (the Page File). (Google to find out how.)
Windows 7 uses some hard drive space as virtual RAM, writing and deleting to it. In practice, it doubles the amount of RAM the computer can "see" and use, guarding against actually using up the RAM and crashing programs. But the size of the virtual RAM can vary, and Windows might have increased the size of the virtual RAM when you doubled your physical RAM. Therefore, Windows could be actually using the hard drive as RAM more than it's using your 8GB of real RAM.
No matter how much RAM you have, it's a good shortcut to disable Virtual Memory/Page File. It seems to make everything a hair snappier.
Battery life will take a hit no matter what, because the second stick draws extra power.

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