Can I Use DDR3 RAM for iMac 7,1 Memory Upgrade?

I'm sorry if this is a silly quesyion but I cannot find an answer anywhere so I thought I would ask here. My iMac (mid 2007) has the following specs:
Model Name:          iMac
Model Identifier:          iMac7,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          2.4 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          4 MB
Memory:          1 GB
Bus Speed:          800 MHz
Boot ROM Version:          IM71.007A.B03
SMC Version (system):          1.20f4
Yesterday, from the Apple Store, I ordered an Apple Memory Module 4GB 1333MHz DDR3 (PC3-10600) - 2x2GB. In the Apple Store it said that this was compatible with all computers shown so I assumed it would be okay with my mid 2007.
From further reading it seems that I will not be able to use this memory and that I should have purchsed 4GB 667MHz DDR2 instead. Is this correct? Will I be able to use the DDR3 that I have purchased or will I need to get the DDR2?
I tried to cancel the order but it was too late. I should have researched it properly first.
Cheers for any advice.
TJ

You will not be able to use the ram you ordered. You need to return it and purchase ram that is
200-pin PC2-5300 (667MHz) DDR2 SO-DIMM. Also, don't purchase ram from the Apple store, they overcharge for it. Look to order ram from a vendor such as Crucial or OWC.

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