So i bought an Antminer S7 and was planning to use two dell 750w server psu's with the gekkoscience breakout boards. I had planned on using two in load balancing mode using a signal wire and two current sharing wires, one positive, one Negative. This is shown here:
http://www.gekkoscience.com/products/D750_3way.htmlAnyways is this setup possible with an Antminer S7? The first thing it says when opening the box is not to use anything lower than 800w if your using one psu for two hashing boards.
So will using the above gekkoscience setup totaling 1500w work with two psu's in load balancing mode? If the psu that powers two boards needs more power will it take it from the other psu? Just want to make sure this is safe. I haven't seen much talk about this setup since the S7 came out.
I am running a Batch 4 4.66 th/s
UPDATE:I Set it up and prayed that nothing would break. I am sad to say it did not work like a 1500w psu and allow the S7 to run! This was very surprising result. Luckily the S7 is still fine and up and hashing.
The psu cut out currently. So Bitmain was right. If you buy an S7 you must have no less than 400w per board. So 800w for two boards. This is unfortunate as i do not want to buy another noisy psu and another breakout board.
Useful INFO about S7 setups:
After I restored my setup with 3 psu I tried to make the two dell server psu quieter by using a single pin wire and grounding the fan pin on a gnd pin. After i started the system up it seemed a tad bit quieter but it was hard to focus as i was scared of something going wrong. And then the HW Errors went over 8%! i immediately shut the system down out of panic, and it is running nice and noisy after scraping that idea.
Also I was running fan speed at normal because i wanted system to run nice and cool with the winter air intake. After changing the fan speed to a sweet spot of 50% (3570rpm front and little less rear). The system warmed up to between 48-52 on chips and the HW ERROR went from 1+% to .0064! Antminer S7 has a sweet spot temp! Hashing is more steady to now.
BTW Antminer S7 @ Fan 50%, This is about the point where you here the dell high pitch psu thats how loud they are under load!