Memory choices for Xserve 2.8 Quad Xeon

I have a Xserve 2.8 Quad Xeon with 4 of 1 GB 800 MHz DDR2 FB-DIMMs.
I want to upgrade its memory to 8 GB and wandering which of the following options I should pick.
1. buy four of 1 GB 800 MHz DDR2 FB-DIMM (4GB Kit FB (4 x 1GB) DDR2-800 (PC2-6400) 128x72 CL5 1.8v 240 Pin ECC FBDIMM (FullyBuffered)) --- for $198
2. buy two of 4 GB (8GB Kit (2 x 4GB) DDR2-800 (PC2-6400) 512x72 CL5 1.8v 240 Pin ECC FBDIMM (FullyBuffered))----for $258
My questions are:
1. Is it true that we shouldn't mix different size of RAM modules? A document on http://manuals.info.apple.com/en/XserveEarly2008_DIY_FB-DIMMMemory.pdf seems to say OK to mix but fill the first four slots with identical modules. "For the best performance, use identical DIMMs in all slots and fill up slots 1 through 4 before you install DIMMs in slots 5 through 8. If you don’t have eight identical DIMMs, install identical DIMMs in slots 1 through 4 and a second set of four identical DIMMs in slots 5 through 8. If you can, after you fill slots 1 through 4, add a full set of four DIMMs in slots 5 through 8 instead of just a pair in slots 5 and 6."
2. Should all RAM modules installed be the same brand and from the same production batch?
I don't want to throw away my current four 1 GB RAMs. But if I fill all the slots with a new set of four 1 GB RAMs, I won't have more room to upgrade. For $60 more, I think it's worth getting two of 4 GB RAMs.
If installing non-identical RAMs is not an issue, I may buy two of 4 GB modules. Use these two new one for now. When its price drops or more memory is required, I'll buy two of 4 GB modules and then put my current four 1 GB chips in slot 5 to 8.
Please comment. Thanks.

1. Is it true that we shouldn't mix different size of RAM modules?
I do know that the reason behind matching four identical DIMMs in the bank is that you get memory interleaving which boosts the performance. What amount if performance increase that may be, I don't have a reference for. Nor do I know what the detriment of installing only two DIMMs in the bank would be..
2. Should all RAM modules installed be the same brand and from the same production batch?
It would be best if they were all the same brand to reduce the chance of timing errors. More important is that they come from a reputable maker and are guaranteed to work in the XServe.
Now, since you're not opposed to spending $60 more for the 2x4GB kit, how about a 4x2GB kit for just a little more? 12GB of RAM, interleaved...
-Doug

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