New 8-Core Memory Config

I am waiting on my new Mac Pro, and I have a question about the memory. I am going to install 4gb in addition to the 2gb that comes installed. I am ordering 2x2gb sticks from OWC. I am little confused on the which riser to put it on.. Should it go on the riser opposite of the one with the stock RAM?
Thanks in advance for the feedback!

Hi and sorry to jump in on this thread but i've just ordered two 1gb OWC modules but barefeats are saying that 2x 1gb and 2x 2gb configuration is not recommended.
This is what they say:
"CAN I KEEP THE TWO FACTORY 1GB FB-DIMMs INSTALLED?"
Some of you ordered your Mac Pro with the basic two factory 1GB FB-DIMMs. You are asking if you keep those installed and just add two or four more sticks.
If you add two more sticks, they have to match those first two. You can add two more 1GB sticks in slot 2 on both risers for a total of 4GB. You can NOT add two 2GB sticks to that slot or your system will only report 2GB total.
A better scenario, if you insist on using those two factory 1GB FB-DIMMs is to order four 2GB FB-DIMMs, pull out the two factory 1GB FB-DIMMs, put the four 2GB FB-DIMMS in slots 1 and 2 on each riser, and put the two 1GB FB-DIMMs in slot 3 & 4 of the top riser. That will give you a total of 10GB.
But if you want maximum memory throughput under all situations, we recommend either 8 matching 1GB FB-DIMMs, 8 matching 2GB FB-DIMMs, or 8 matching 4GB FB-DIMMs.
Seems i don't gain from having 6gb?

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