Re: Bitmain Announces the Antminer R4 and APW5 Power Supply, Designed for Silence

My S9 is not more noisy than an S3 at the moment. Plus heat output is great as it saves on heating at this time of year.

You're saying the S9 is about the same noise level as an S3?? Or your under-clocked S9 is similar to S3?