Guys, please make this clear - have you achieved more hashing power (stable long-term h.p. both at miner's and pool's side with normal reject/discarded/stale/HW rate) after S2 overclocking or not?.. 
Also - what firmware do you use, what clocks have you set?
I will today replace 2 big fans with Noctua NF-A14 PWM (to see whether it will work more quiet having the same temperature), replace PSU with Chieftec 1250 W and try to OC it.
Also - what firmware do you use, what clocks have you set?I will today replace 2 big fans with Noctua NF-A14 PWM (to see whether it will work more quiet having the same temperature), replace PSU with Chieftec 1250 W and try to OC it.
Mine runs silent. I swapped my fans for 8x Prolimatech PRO-BV14 which are only 18dba. Akasa makes a higher CFM fan at 24dba which might be better but I'm not sure how loud that would be. I pointed all 4 side case fans inward and removed the case and put the other 4 directly on top of the boards to blow the hot air upwards. My max temp is 53c