Can I upgrade my MacBook Pro RAM further with Snow Leopard?

I have a Macbook Pro that's 2 generations old (it is the model right before the single body model)

Currently, it caps out at 4 GB ram. I was watching the new apple keynote and got a little confused. With Snow Leopord do I still have the 4 gb ram cap out or can I upgrade even more?

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Tags: apple, Mac, MacBook, RAM