Can I use ddr3 ram in a ddr2 slot?

I have a 17" MacBook Pro that has ddr2 667 ram and i want to know if ddr3 1333 ram is compatible.

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no - DDR2 and DDR3 are not compatible nor interchangeable.

aside from electrical differences (voltage, signal timing etc) the SO-DIMM modules should be keyed differently, additionally I think DDR2 SO-DIMMs are 200 pin whereas DDR3 are 204 pin, they shouldn't fit in same slots.

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