2GB + 1GB advantage?

i want to upgrade my RAM

i've 2gb ddr 3 stick and my mobo have only 2 slots. (gigabyte h55)
i found 1gb stick is so cheap, around 15 usd so

should i upgrade to it? (2gb stick is also cheap but i'm now with 32 bit window 7 with 512 mb discrete graphic)
so which one is more advantage to buy 1gb or 2 gb? (i think 32 bit can't handle 4gb to full capacity)

and one more question will 3gb be effective on my system and WEI will come up (my current wei of RAM is 5.5)

thanks in advance
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More about advantage
  1. It won't be running in dual channel mode, but it wasn't anyway. :)

    Best would be 2X2 even if the OS canot use all of it. Next best is 3 GB. 3 is better than 2.

    I don't know if it will improve your WEI.
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