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If a motherboard's specifications say it supports DDR3 SDRAM sticks, would I be correct to assume it is also compatible with DDR2 RAM? Am I wrong, or does it depend on the motherboard?

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up vote 20 down vote accepted

No. DDR3 and DDR2 are designed differently. Both have different key placing so they won't even physically fit, not to mention differences in electrical voltage:

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There are motherboards which will provide entirely separate slots for DDR2, but you cannot use DDR3 in DDR2 slots, or both types together.

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dang it, beat me to it by a minute! –  Sathya Nov 25 '09 at 21:59

Supports DDR3 SDRAM sticks, would I be correct to assume it is also compatible with DDR2 RAM?

That's incorrect. DDR3 Rams are PIN & voltage incompatible.

Or does it depend on the motherboard?

Certain motherboards provide DDR2 & DDR3 slots, but you can use only 1 type at a time, you cannot mix and match both

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