What is absolute max ram for a macbook pro 2,16 core 2 duo processor?

Hello guys, thanks for reading this post.
i read so many people saying that my 2007 mbp only going to max at 3GB if i put 2x 2Gb ram
i look up on apple store memory, my processor doesnt show as choices
i then look up on OWC website, and they show my macbook pro 2,16 core 2 duo is in fact a "model identifier" macbookpro2,2
which made me viable to get full 4GB.
just to be sure, my macbook pro serial number is
W87****W0G
and this macbook pro now has 2x 1GB ram pc2-5300
i saw people selling pc2-5300 on cglist, but they look so long and different from the shorter and taller one on apple and owc website.
so i am a bit confused, isnt this pc2-5300 not the same thing for all pc/mac? the one on cglist was made from hp, so i didnt contact the seller.
well, i am running mac osx lion now
will be plugging lacie expresscard usb 3
and will be using aperture 3 (which req lion to use so i cant downgrade os)
and i had few issues of screen occasionally flickering, does that mean i need more Ram??
sorry, i go a bit off topic here.
thanks for all you who keep reading and hopefully have a bit to say back to me.
cheers
Vito
<Edited by Host>

update:
after the information i posted above
i checked again my memory use in the activity monitor
and its true, only 3Gb is being used even the about this computer info says 4Gb.
thus, i returned the one 2Gb card and use one 1Gb from old one.
it made exactly same effect, nothing different.
i thought i just made this post so anybody have same issue later would know

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