RAM-two new ones or one new one and the one i've got?

Hi
I've got a MBP which i use for editing graphics, movies, websites etc. With dreamweaver, photoshop, flash and other stuff all open my free ram gets pretty small.
If i were to upgrade to 4GB should i buy two new 2 gig or just one and use the one i've got already?
Thanks
Iz

Izaak,
It is important that the RAM is a matched pair, identical in every way, so unless you can buy RAM that is identical with the one already in the computer (just having the same GB is not enough, needs to be same brand, same specs etc. Probably the wisest thing is to buy a matched pair and replace the current RAM. Apple resellers often sell non-Apple RAM and I would be asking their advice if I were considering buying just one. They are likely to know what to match with what if they have good staff.
Also RAM is very sensitive to any level of static electricity. Be very careful to ground everything as you install it.
Tony

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