How much ram can my MacBook Pro 15 Inch, Early 2008 2.4 Core Duo 2 Take? 3 or 4 GB?

My MacBook Pro 15 Inch is a early 2008 model.
It is a 2.4 Core 2 Duo.
I'm confused if it can take a max of 3 or 4 GB RAM.  Right now it has 2 GB.
First question:  Can it take 3 or 4?
Second question:  Will I notice an increase in speed?
BTW - I checked the Apple document on removing/installing memory - but the matrix where my early 2008 15 inch is covered is confusing and it seems it would fall into either the 3 or 4 - depending on how your read it.

Get the free MacTracker, it will give more accurate RAM information than the manual, as the manual get printed with the current RAM being sold, not the new stuff, so your Mac could possibly hold more.
Yes your computer will be faster at some things with more RAM, but like a car, many parts also have to be fast, the CPU, the GPU, the hard drive speed, bus speed etc.
Some things you can change, other things you can't and sometimes you need to backup your files and wipe the disk and reinstall everything all over again.
Sometimes it's a slow Internet, or slow wifi network or something running on your machine.
Host of issues cause slowdowns, this might be one of them
http://support.apple.com/kb/TS3802
You can turn IPv6 off in your System Preferences > Network > Airport > TCP/IP settings.

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