Back to the main topic. nikhsub, I have had a very similar experience to yours. I increased tubing at one point to 1/2" and also increased pump size. The overall difference was nil.
I've said it before, I'll say it again. In watercooling computers, once you get to a flow rate beyond 20-25 gph, the benefit of any higher flow is almost nothing.
You can show me all the charts and graphs you like. I speak from first hand experience as well as the experiences of many others who have made the mistake of adding more pumping power and larger tubing to their watercooled computers.
I will say that there are some applications that may benefit slightly from more flow, specifically those setups where flow was horrible to begin with. But once the minimum flow rate is achieved, no amount of pumping power or tubing enlargement is going to make much difference.
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