Some of ya'll got it partly right...
3/8 id or 1/2 id, they all restrict flow, but the 3/8 id will be a lot more restrictive.
I've looked up plumbing specs, and flow rates, and what I've seen is that 3/8 id is good enough for most people, but those that have a higher flow rate, do benefit from the 1/2 ID, because those high flow rates warrant the use of 1/2 id tubing.
For most of us though, the difference between 3/8 id and 1/2 id, for the low flow rates we have, really doesn't make much of a difference.
What we all need to keep in mind though, is that every part of a cooling system restricts flow and that the biggest restrictor is, by far, the waterblock.
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