I heard that Leopard doesn't even USE the full capacity of the 8-Core Nehalem processors, but in the future Snow Leopard will. Is that true? I'm thinking about buying an 8-Core Mac Pro. Is this technology so advanced that it won't be obsolete in 3 years? If I buy a new quad-core Mac Pro and don't think it's very fast for me, can I trade it back toward the 8-core? Is the fastest Quad-core (One 2.93GHz Quad-Core) faster than the slowest 8-core (Two 2.26GHz Quad-Core)? If I buy the quad-core can I upgrade it later to 8core and utilize all 32GB ram?