Installing medium-cost RAM on my Mac Pro

Hi everybody!
I've just bought a 2x 2.66GHz Mac Pro and it's wonderful. However, I ordered it with a minimum configuration because I thought I could find expansion pieces on the market.
Is there any problem if I install a 1GB-667-DDR2 RAM module non-ECC and unbuffered (it is to say, different from the ECC FB-DIMM from Apple, which seems to me TOO EXPENSIVE)?
I've read about heating > noise troubles, but I can't really believe them. Has anyone of you tested a medium-cost (e.g. Corsair) RAM module on a new Mac Pro? Does it give good results?
I didn't find problems when looking for a 3GB/s SATA HDD, but it's difficult and -above all- expensive to buy an Apple RAM module or other brands' ones with the same technology.
Can anybody help me, please?

Shima,
To quote from the Apple site for you on the performance benefits from symmetrical RAM configurations on Mac Pro.
The Mac Pro comes with two memory riser cards, each with four DIMM slots. With a total of eight slots, you can add up to 16 GB of memory. Memory DIMM pairs should be installed evenly on both risers. This table shows Mac Pro RAM configurations that will achieve ideal performance:
Riser A contains: Riser B contains:
2 x 512MB 2 x 512MB
2 x 1GB 2 x 1GB
2 x 2GB 2 x 2GB
4 x 512MB 4 x 512MB
4 x 1GB 4 x 1GB
4 x 2GB 4 x 2GB
Note: DIMMs must be installed in pairs of equal size from the same vendor. For instance, you must not have one or three DIMMs on either riser at any time. Additionally, two DIMMs from different vendors should not be combined and used as a pair.
From tests I've read around the web, filling the slots as Apple suggests achieves a 5-7% performance boost. Whether your MacPro would even recognise ram installed randomly, or in unmatched sizes is something I do not know.
Enjoy your MacPro, I am jealous.
G5 Dual 2ghz, 3.5Gb Ram, MacPro soon I hope. Mac OS X (10.4.7)
G5 Dual 2ghz, 3.5Gb Ram, MacPro soon I hope. Mac OS X (10.4.7)

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