I'm pretty sure the controller doesn't get power from the hashboards. The peripheral circuits of the hashboards (like the PIC and DPOT that set the string voltage) actually draw power from the controller, not the other way around. Worst case with a PSU common to hashboards and controller is they get powered at the same time.

If you use the controller PSU to kick on the secondary, that violates Bitmain's recommendation to have the controller PSU always come on last. You'd have to momentary turn on the secondary PSU bypassing your mains switch, then let the controller PSU latch it on. If you want to play by Bitmain's recommendation anyway, so it's still the same problem noted in the first page comments.

I was talking about someone else.

I didn't take apart my S3, but I did hack up the block erupters, the AM Blade (that one took all of 12 hours from landing in my mailbox to hashing at 35% over stock clock), AM Cube, S1s, S2 (I bought the kit, not the preassembled unit), AM Tube (Novak and I were finding proxy workarounds to its broken stratum before most people in the US even had theirs yet), New R-Box, U3, Gridseed pod, Garden AMV2, Avalon1, Avalon2, S5, X1, X3, S4, S4+... hm, I might be forgetting some. That's actually why I got into mining was because the hardware was fun to mess with.

Of course, almost none of those were bought new. A lot of it was gotten dead for repairs, or for the museum shelves.

...it gets cooler? Dang, I'm in the wrong business. That's freakin' sweet.

I'd consider buying an S9LN, and then take it apart.

The one to be delivered here today looks like it was picked up late and sat for a while, so it probably won't arrive until Thursday. Tomorrow possible. Darn, and I was hoping to be the first one to post pictures.

I've placed the first order with Bitmain for the first 6 units. I used some of the tip money from early on to pick up a seventh machine, so I'll have an extra in case something goes weird. I currently have two more orders paid, another transaction pending and at least one other guy waiting for coins to come in, so there will be a second round in a few days.

I think I'm gonna adjust the price to 0.61BTC on account of coin was very strong yesterday when I bid the order, and now a miner plus shipping is a shade over 0.53 instead of 0.51BTC. If you've already paid, no matter, but if you're placing an order in the next 24 hours the price is 0.61BTC. If coin goes back up to yesterday levels, or the price goes down from Bitmain, I'll adjust again.

Yeah, but a couple of those orders have yet to identify themselves.

Inbetween things today, I'll be getting some operating data from different voltages and clock setpoints. I've got a stack of pregenerated hex files for different hot/cold settings and when I put up the analysis numbers I'll also post a ZIP file with all of 'em in it within a few days.

Right now it looks like 750MHz might be just a bit high for the 720/690 profile ( .03% errors) for 3.38TH from 900W at 61C, but that's still pretty decent. I think the cold-running is about the same setpoint as a stock full S7.

If you don't turn the voltage down from stock, 150MHz will pull about 600mA off the USB port. That may be causing you problems. Adjusting the voltage down about an eighth of a turn will put you more like 520mA, and at that voltage and 125MHz clock you'd be seeing about 440mA, which is well within USB spec.

I don't know your hardware limitations, but my Dell laptop would pull about 1A before throwing fits. Some things drop out just above 500mA, and some ports are good for 1.5A - it depends on the hardware. Using a powered hub is usually recommended because it takes out a lot of questions.

If you're looking at DC power, each blade needs around 400W and the controller and fans burn another 60 or so.

The chips cache work and cgminer updates it, so if cgminer stops sending work the chips will keep hashing on the last thing they were given. Even if they don't, there's still some power being burned in there while the chips idle (maybe on the order of 1W per chip), and if it's not allowed to escape things will get toasty. One guy on here has reported losing a couple blades due to overheats from that very problem.

If you want to run it on two PSUs, there's a risk of the controller PSU shutting down and the boards on the other PSU overheating. If I was running a 750 and a 1300, I'd hook the controller and two boards off the 1300 and the third board off the 750. I would then wire one of the fans to run off the 750, except you need to keep the blue and yellow wires from the fan tied into the controller so it still has speed control and RPM readings. But what'll happen is, worst case, your 1300 shuts off and you still have one board making heat but you still have one fan to cool it.

Normally with a reported WU that low it'd be sending a bunch of errors, but I don't see any. 150MHz should be 8.25GH and about 115 WU, so I really don't know what's going on. What's it plugged into? Is your hub underpowered? You might try turning the voltage down, rotate the setting counterclockwise about one eighth turn and see if that helps. That's behavior I haven't really seen before.

Well, at least it's accepting shares. Let it run for a few minutes then put up another screenshot of cgminer.

Does the green LED ever flash white?

Sure, if you got a PicoPSU. Buying one of those that take in 12V directly and provide all the connections for a motherboard is a heck of a lot easier than me designing a new board to do it all and provide the cabling.

I got a mostly-working S4 for free end of last year and gave it the same treatment to heat my apartment over the winter. Well, I didn't replace the fans but they did run a lot slower.

I'm perched happily in Missouri, US where a dollar goes about 7% further than a lot of other states.

Also, if anyone needs any 20A single-pole breakers like would fit in a Square D Homeline panel, I got at least 20 of 'em I don't need. They sell here for around $3

I just did the math. Frequency times chip count times core count equals hashrate, for the numbers given for an S7.