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Originally Posted by bobkoure
Caveat: I watercool pretty much for low-noise. I tend to dial down fans until they're unobtrusive (guessing under 18dB) and then look at MBM-reported temps, both idle and CpuBurn. I do overclock, but low-noise gets priority....
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aha, me2, cause watercooling won't bring me 2 much advanced overclocking space above aircooling, 1 or 2 degrees hotter would be worth to pay for the lower noise.
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Originally Posted by bobkoure
I've found, in my very limited experimentation, that plenum size (shroud depth, if you prefer) makes more difference if you're pushing air through a radiator, rather than pulling - so long as the "pull" side of the blades has no obstruction within, say, half a chord-span (otherwise you get interference with the fan - they're not so much augurs as wings so coanda effect is important - and can be easily screwed up).....
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Did you mean the deep shroud is more effective in a fans' pushing setup than the pulling one? When the factor of the rebounded air by the rad is taken into account, the situation could be different. More space can avoid the dead zone of the axial fan, but at the same time the force is weaker. Like aircooling, a weak fan cannt blowing the air deep enough to the hottest base of a heatsink.