Can I use DDR2/667 ram in a machine wants DDR2/533 ram?

I searched all over these forums, googled my eyes out, read the dev note for my machine and could not find a definitive answer...
The scenario is this: I have a PowerMac G5 (Late 2005) M9590LL/A, that is spec'd for DDR2/533 or PC2-4200.
I have a friend who just bought a 24" Intel iMac and upgraded the ram to 2 GB, thus he has 2 pieces of 512 mb DDR2/667 that are unused.
He will sell them to me at a very good price. Will they work in my machine? Can you use FASTER ram and will it clock down to the proper speed in a machine that is looking for slower ram?
Right now in almost all places online the DDR2/533 chips are MORE expensive than the DDR2/667 chips.
Right now my machine still has the stock of 512 mb of DDR2/533 ram (2 pieces of 256 mb).
Another friend told me to just put the chips in and see if they will work, I do not want to do this if there is some minor voltage difference that will either damage the motherboard or the DDR2/667 chips or both.
I know in the PeeCee world, you can use PC133 ram in systems that need PC100, and DDR/333 ram in systems that need DDR/266, and likewise DDR/400 in systems that are looking for DDR/333, but I remember reading that DDR2 ram is more sensitive to BUS speed and voltage than DDR(1) ram.
Any ideas?
Please help me :>
Thanks!
Dual-Core 2.0 ghz -M9590LL/A Mac OS X (10.4.8)

Welcome to Apple Discussions!
Even if you found a similar form factor module with a
higher spec than Apple's official, I would not put it
in the machine. Mac OS X can be very particular
about the kind of RAM that is installed, and panic if
the wrong kind is installed, or cause problems such
as unexpectedly quitting applications. Follow the
specs to the letter. See my FAQ:
http://www.macmaps.com/Macosxspeed.html#RAM
So you are basically saying that higher-clocked ram will not spec down to run slower?
Thanks for the info. I will give a good read to the link here to your FAQ.
:>

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Can I use DDR2/667 ram in a machine wants DDR2/533 ram?

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