My CSP-750 (which I bought from Ed) is definitely not inaudible. I run it a little over 7V to get rid of a whining sound not unlike a hard drive's. No gurgling noises, but my flow must be little more than 2LPM at 7V. The lower pump speed costs me about 2C on the reported CPU temp. And you need a quiet system/environment for a CSP to be a noise problem.
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