Maximum RAM in 2.33Ghz MacBook Pro 15"?

For Christmas this year my aunt decided to be really nice and order me a 2GB chip for my MacBook Pro, propping me up from 2GB total to 3GB. Anyway due to an issue with ordering online she now has two 2GB chips.
Now I've heard that the maximum my computer can handle is 3GB total but I've also heard it's a bit above that, 3.3GB or something. I was thinking it might be worth it for me to pay her the $50 she paid for the extra chip if, in fact, I can get a bit over 3GB as the more RAM the better.
My question to all those around the forum who know more than me is what is the absolute max usable RAM for my computer?
Model Name: MacBook Pro 15"
Model Identifier: MacBookPro2,2
Processor: Intel Core 2 Duo 2.33GHz

ChrisSpera wrote:
I would think that its just a firmware update that would be required to have the notebook use the extra 1GB of RAM if it doesn't already.
That's not the case: it's a built-in limitation of the architecture that was in use at the time. PC notebooks using the same Intel architecture also suffered from the ~3.2GB limitation, though some, such as HP, explained it to purchasers a bit differently. Long story short, a firmware update will not be able to affect it: the limitation is permanent.
See http://blogs.zdnet.com/Apple/?p=321 for a bit more technical information.

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