Well, most motherboards tend to be very strict about what kind of CPUs they'll like. You may need to update the motherboard's BIOS in order to get it to like the new CPU (of course, you'll need a compatible CPU to get it that far).
The type of backwards compatability you're thinking of works with RAM, but unfortunately I don't think it works with cache sizes.
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Eat antimatter, Posleen-boy!
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