Okay! Thank you very much.
Wow RAM sticks sure are cheap in the US, where I live I can't find 6GB for under 100 $!
I did some reading in the manual (yeah should've checked that out earlier
And what I found was this :
"When memory modules of different capacity and chips are installed, a message which
says memory is operating in Flex Memory Mode will appear during the POST. Intel Flex
Memory Technology offers greater flexibility to upgrade by allowing different memory sizes
to be populated and remain in Dual/3 Channel mode/performance."
And it also says that if I add one, like you said it will be in Dual Chanel.
But for the sake of my wallet i'm probably going to buy one stick of 2GB. Still a poor student xD.
Thank you! problem solved.