Weird Video Card Glitch in XP vs Mac OSX

Hi, so my problem isn't really a problem exactly, but it's got me stumped. I'm running a mid-2009 13" Macbook Pro, which has both Mac OSX and Windows XP SP3. In OSX, the system tells me I'm running a Nvidia 9400m at 256 mb vram, yet Windows XP tells me my 9400 m has 512 mb vram. I checked on my Mac to see if I had a better card on as well, but energy saver had no options for higher performance. So I guess that rules that option out.
Any answers? Thanks for your time.
Message was edited by: guile147

Right, that's what I thought, but then I had read some stuff about some of the RAM being used to give to the video card, and It got me thinking. Anyone else have information about this?

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