I recently updated the original ram from my 2.66 Ghz Intel Core i7 15" laptop. Can I take that ram (4GB set) and put in my iMac 2.4GHz Intel Core 2 Duo?

The 15" power book had this:
Memory Type: DDR3 PC3-8500, DDR3 (non-ECC)
The 20" iMac has this:
Memory Type: DDR2 PC2-5300, DDR2 (non-ECC)
I'm not sure what the difference between DDR3 and DDR2 is. Any support would be great.

DDR stands for Double Data Rate, the original DDR had a speed of 266MHz, double the rate of the previous memory standard of SDRAM which ran at 133MHz.  DDR2 and then DDR3 are the successors of DDR.  To avoid fitting the wrong type of module they use different memory slots and will only fit the one they were designed for, by way of slots cut in the memory boards at precise positions which correspond to notches in the memory slots.
If you want to know what memory will fit which computer I would go to the Crucial website and use their online Memory Advisor, put in the brand and model, it will tell you exactly which modules fit it and what kits (if any) Crucial have available for it.
http://www.crucial.com/

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