The three from my customer are capped at 1100W, as per Zvi's recommendations. They're each hashing stably at around 3950 GH/s. Currently, I'm seeing 3923.69 GH/s, 3951.675 GH/s, and 3982.555 GH/s. These three are all running 2.2.35.
This simply isn't the advertised (after adjustment) 4.5TH. WTF? Is spondoolies trying to lower the rate still further? 6.5Th -> 6.0TH -> 5.5TH -> 4.5Th -> 4.0TH. Where does this stop?
Everybody who has been paying attention has known for ages that Spondoolies equipment suffers a performance penalty on 100-120V. This was not at all a surprise. Zvi and Guy have warned that 120V users will se a large performance penalty, and they strongly recommend using 200+V. Performance for these machines should go to around 4.5 TH/s once I get them on 200+V.
Power supplies have lower efficiency and lower capacity when run on lower voltages. Spondoolies's machines operate at or near the limit of their power supplies' performance, which means that running on 120V slows down the machines.