Guild Wars 2

says 2gb memory is ok but can change over time so 2months into the game my 4gb is not enough that was fast fast change

Minimum requirements normally don’t mean more than what you need at least
to start the game .. nothing more.

basically when they say 2GB it means 2GB available, so for example

you have 4 GB installed on pc.
1GB for operating system
500MB for other general applications like antivirus, defrags, and email clients
lets say 300 – 700 mb for web browsers u might have open

this would leave u around 1.7GB – 2.3GB or so. Basically u could run the game as long as other components meet the requirements like cpu and video card.
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the 64bit client can use well over the 2GB