Can I use PC2-6400 ram in my iMac?

I have a iMac Intel Core 2 Duo 2.16 GHz with the standard install 1gb (2x512mb) ram.
I want to upgrade to 2 gb (2x1GB) and I want to know if I absolutely have to go with PC2-5300?
iMac intel 20" 2.16 GHz   Mac OS X (10.4.8)  

I think the absolute worst possibility is it would clock back to PC5300...
The PCxxxx is really just a "speed" rating, e.g. PC2-5300 is rated at 667MHZ, PC2-6400 is rated at 800Mhz.
Although I have never tried it, my experience dictates that it will just clock back to a slower speed.
Then again, why waste the money on 6400 when you would never be able to tell the difference between 667 and 800Mhz as the bus is not capable of supporting it.
Cheers!
DebtManWalking

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