Can i install 800MHz memory on my mid 2007 imac?

I'd like to upgrade the memory on my imac: 24 inc mid 2007 (iMac7,1).
It currenlty have a 1GB stick and a 2GB stick.  Both 667MHz DDR2 SDRAM.  Can I install 2x2GB DDR2 of 800MHz?  and if so, would that be an performance improvement?
Specs:
24in iMac7,1
Intel Core 2 Duo 2.4GHz
Bus Peed 800 MHz
Memory: 3GB (as above both 667MHz)
Thanks

You are welcome. That is the same machine as mine (20" version). Although Apple rates it as accepting 4gB, outside vendors have tested it with 6gB. This happens quite often with quoted RAM quantities.
Maximum Memory     6.0 GB (Actual) 4.0 GB (Apple)
Memory Slots     2 - 200-pin PC2-5300 (667MHz) DDR2 SO-DIMM

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