It's a shame there were so many S4's out with problems.
Mine came in, I manually set difficulty, increased the frequency and consistently hash at 2.3TH no problem and no complaints.
ditto. 1st tried Eclipse - as 'stock' one s4 would not go over 25-30ghs and the other one - that arrived only 1 day later - does better holding @ 1.68THs on EMC. Applied CK's tweak and both now rock-solid at 1.98-2.28THs.
Anyone know if the changes CK made will be put into an official Bitmain update so it is not lost on hard-boot?
OR - since it seems the S4 is running off of a RAMdisk created on boot and loaded with the miners running files, anyone know where the master copy of the CGminer file is located and if it can be replaced with CK's tweaked one?
As for US residential powerlines... this should be a major design concern for Bitmain or any other miner mfgr because PSU's do NOT like low lines... In Detroit area home power is 110v - not 120 - and during summer will often drop to 100-105v. The '220v' incoming reflects the same drops. This year it got so bad (hit 95v for 2 weeks) I had to wire in a boost transformer to make up the difference...