4x512MB - adding 2x1GB: What is the best configuration?

Hello,
I just ordered a MacPro with 4x512MB installed from Apple and an additional 2x1GB from MaxUpgrades.com. (For a total of 4GB)
What is the best way to install the ram on the riser cards to get the best performance for my memory scenario?
Looking forward to your suggestions.

Best way is to put the 2x1GB on one riser card in the slots closest to the motherboard. Put 2x512MB on the other riser card close to the motherboard. The question is what to do with the last 2x512MB - I'd say it would be best putting them on the same riser as the 2x1GB in the 2 slots away from the motherboard. You basically want the higher capacity 2x1GB DIMMs on the same riser card close to the motherboard.
See http://www.anandtech.com/mac/showdoc.aspx?i=2832&p=1

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4x512MB - adding 2x1GB: What is the best configuration?

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