Which memory modules to use for upgrade 8 core Mac Pro

I am planning to upgrade the memory in my new 8 core Mac Pro, I use it for graphics and video editing (FCS2), I am wondering what would be the advantages and differences between getting the 8GB upgrade in 2-pair of 4GB module or 4-pair of 2GB module, I know the price for the first choice is almost double the second.

OK, so according to the http://www.barefeats.com/harper3.html Memory Tests, all slots filled means the fastest speed. So here's my question:
I'm about to buy a 2,8GHz MacPro with 2GB RAM, and I want to upgrade to 8GB. I was considering buy an 8GB Kit from Crucial (629.99$), and either leave the original 2GB and add the 8GB to the free slots, or just take the original out and leave only the 8GB modules. And this would be my question before reading the Memory Tests article.
So I went back to Crucial's online store and did some math, to see how much it would cost me to fill the remainder slots (6, counting off the 2 used by the original RAM) with 1GB modules, instead of my previous idea of 8GB (2x4GB). So, a 2GB Kit (2x1GB) cost 127.99$, multiplied by 3, which is what I would need to achieve a total of 6GB, to add to the original 2GB, will cost 383.97$.
That's 246$ less than the 8GB Kit! And according to the Memory Tests, even faster.
Isn't this too good to be true? What's your word?
Thanks a lot.

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