Sirpent,
Your question represents a potential can of worms. Strictly speaking, efficiency is generally defined as useful work produced divided by required energy input. In cooling, I would interpret this as minimum cooling system power consumption while keeping the computer operational. Under this strict definition, lower flow will always win because chips can run a lot hotter (at stock speeds) than we tend to let them. Again, strictly speaking you can cool a top end XP at stock speed with room temperature water flowing at a rate of about 1-2 gph provided you've got a block designed to work with that flow and can stomach the temperatures you'll have.
If you've got some other definition for "cooling efficiency", describe it and I'll give my best shot at an honest answer.
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