Adding new RAM to Mac Pro

I just got my new Mac Pro. It comes with (2) 1G sticks of DDR2 RAM. I bought (4) 2G sticks of DDR2 RAM from OWC to put in it. Can I just add my 2G sticks and keep the 1G sticks in, or do they all have to be the same size?
I spoke with 2 different Apple reps on the phone today, and they gave me 2 different answers. One said no - they all have to be the same size. The other said I could use different sizes, but they just have to be paired.
Anyone know what the right answer is?

Hi
my Mac Pro configuration in the system profiler only shows 512MB cards in Raiser B DIMM1 and DIMM2, allthough I have added new 2G cards into Raiser A DIMM3 and DIMM4.
The Raiser A DIMM1 and DIMM2 slots are occupied by 512MB cards as well, but these are also not visible in the Memory Slot summary.
Question: It seems I have 6GB memory, but only 1 MB visible in the Memory Slot summary. Is this possible and how can I activate the whole memory?
-Lauri.

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    Message was edited by: priv510
    Message was edited by: priv510

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    Message was edited by: priv510

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