Yeah, I know. I tried them with 1 miner per EVGA psu, plus the third on an old Corsair TX750. Still no luck overclocking. I am using a Kill a Watt, and am measuring 1080W at the wall at stock speeds. The max it ever hit was 1150W when trying to overclock.
Well how are you going to overclock 3 S3's with 2 power supplies that can't supply enough current to do it??
Each S3 at 250 will draw 400+ watts.
I would connect just 1 or 2 and try to overclock them 243 and 250. if they work then it is what I noted, the power supplies cant supply the amps needed for 3 overclocked
Here are some stats I gathered, just for information sharing. As many are aware, the power from the wall depends on PSU efficiency and used capacity (% of MAX). A single 1000W PSU powering 2x S3+'s will draw more power from the wall than 2 separate same model 1000W PSU's. The higher the PSU capacity , the lower the efficiency.
MHz Setting Avg Gh/s Watts "Efficiency W/Gh" PSU Model
225 453 400 0.88 1000W Coolmax, 80 Plus Bronze
225 453 365 0.81 1050W Cougar GX1050, 80 Plus Gold
225 453 390 0.86 1200W Coolmax, 80 Plus Gold
237 470 415 0.88 (Running 2x S3+, Values are per S3+)
250 500 445 0.89
225 453 365 0.81 1300W Rosewill Lightening, 80 Plus Gold
237 475 385 0.81 (Running 2x S3+, Values are per S3+)
250 500 405 0.81
thx for sharing, might be a noob question ... if power is 230V compared to 110V would it make a difference ? i think it would.