Macbook Pro 2.16 memory

I bought a macbook pro 2.16 off a friend a couple of years ago. It came with 2gigs of RAM. I recently received 2 2gig sticks from my girlfriend out of her busted macbook pro. I understand that my machine will only (supposedly) recognize 3gigs. However, after installing the RAM, System Profiler tells me that there are 4gigs in there, recognizing the 2 gig sticks in each slot. Is it only using 3 gigs, even though it says it recognizes 4? Or is it somehow actually using all 4?

Cool. Thanks. Just wanted to be sure. The guy who sold it to me left on there the entire Adobe CS 4 Suite. Stinks that I can barely use much of it because of the lack of memory. Rendering a video on Adobe Premiere with 2gigs is a bear. A very slow and sloppy bear.
Not sure that 4 would be that much better, but still ...
Oh well.

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