VERY SPECIFIC RAM QUESTION (not answered in prior topics)

I have a very specific RAM question. I've been pouring through the discussions and I see TONS of stuff about the proper way to upgrade RAM. I've done that before without incident, but here is my dilemma:
I'm using the 3.0Ghz, 8-core, MP currently with 8GB of the 667Mhz RAM (8x1GB). The memory is all matched from OWC and I have had no problems.
I just bought 16GB of new RAM from OWC (4x4GB).
I'm going to remove all 8 of the current 1GB DIMM's, and place two of the 4GB DIMM's in slots 1 & 2 on riser A, and two of the 4GB DIMM's in slots 1 & 2 on riser B. That will give me 16GB's in matched pairs on slots 1 & 2 of both riser A and B.
My question is this: Should I install two of my old 1GB DIMM's in slots 3/4 of riser A, and two of the old 1GB DIMM's in slots 3/4 of riser B (for a total of 20GB's)?
I've read that having all 8 slots filled = better performance but I'm not sure the mix of 4GB DIMM's and 1GB DIMM's.
Any Thoughts?
Thanks So Much,
Tom

Optimally you want matched quads in each Riser. However, Bare Feats did some memory benchmarks that you might wish to read regarding memory performance versus different configurations. As for proper installation see the following:
Mac Pro memory arrangement photos;
Mac Pro Memory Configuration.

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