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Originally Posted by JamesAvery22
Single pass has a lower pressure drop so more flow which equals better performance in most cases.
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I'd love to see some well performed real-world testing showing this to be the case.
According to my calcs, the effect of a 120.2 dual pass HC on a WC loop that uses either of the high-impedence design water blocks (fins like LRWW or cups like Cascade) is negligable.
Eg: At 6.32 LPM I get a head of 0.116 mH20, versus 1.5mH20 for the block and 0.106 mH20 for the tubing.
Therefor, even if going to a zero resistance HC, the increase in flow is likely to be less than 1 LPM, and hence the impact to the block's performance is going to be less than 0.01 C/W.
Its going to be a different story on rigs that have high flow rates, but a 6 LPM or less its SFA.