I have unusual situation: my PSU made much noise in ETH mode only. So, I have to continue with dual mining in order to reduce the noise. Stupid situation, but can't do nothing.
Strange situation at all, probably for some reason in ETH mode your setup is consuming more power from PSU. I tried with my rigs and the only way to do that is when Im using stock config of my GPUs and the power consumption is higher.
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He did not specify what kind of noise his PSU emits - is it fan noise or coil whine. Coil whine can actually be much more audible at lower power load.