Funny, I was just talking about the same thing with an employee. The old SDR 8-port switches were incredibly loud (A low-port DDR one was never made.). It was amazing how much noise a small little device could make...but be warned. Almost all CX4 based switches were/are loud.
We eventually introduced the IS5022 (8-port QDR IB with QSFP), and now of course we have the SX6012 which is 12-port FDR. Both of those systems are QUIET.
now, I know you are looking at DDR only...but what you could do is get the IS5022 and use QSFP to CX4 hybrid cables to connect to your DDR adapters. The QDR switch will autonegotiate down to DDR.