Also do you own a bat and a video camera?

Well daggum that's super handy.

Testing on the Molex board looks good, so I have no qualms about manufacturing that guy.

I'm working now on designing ATX adapter boards, but figured I'd ask a question before finalizing anything.

A standard ATX PSU outputs 5V standby power until the motherboard sends it an "on" signal, at which time it fires up the other rails (3.3V, +/-5V, +/-12V). I intend to design a full-feature board with all these rails, including a switched (and on a fancier version, probably regulated) 12V rail for motherboard power and EPS, so that a computer can be run properly from a 12V source without requiring disconnection to safely and completely power down.

A simpler board would meet most people's needs, with an unswitched 12V rail and the like. Should it be designed with 5V standby and motherboard-signaled rails, or is a simple "rails come up when 12V is applied" board good enough for most folks?

EDIT - regarding cables, I have to use 18AWG on anything that gets two wires to a pin (so all leads on 6-pin splitters and one GND on 6+2 which jumps to the +2) but everything that's a one-to-one gets 16AWG wire. Been that way since I started making cables 3 years ago; in fact, I didn't even start stocking 18AWG until last month.

I did it to about half a dozen S7 (and resold most or all); my experience is pretty much the same as the above poster. The only difference between S7 and S7LN boards is heatsink size.

Everyone using cgminer-gekko faces that issue. It's a bug known since about a hundred pages ago that was never fixed.

Can't help you there, don't use wifi or Windows firewall or whichever you got there. Glad the cgminer-gekko is working though.

But judging from the screengrab it looks like you're connected to the pool alright, but the stick isn't hashing. Did the LED flash white at all? Try unplug and replug while cgminer is running.

Take it from any stock cgminer Win32 archive and copy it into the cgminer-gekko folder.

Also I wonder if the reason the Win32 cgminer-gekko crashes is the missing zlib.dll

They cost $25 new if you bought direct from the manufacturer; the majority of purchases were through a reseller.

Try emailing ASICPuppy service or PM forum user CrazyGuy. Maybe he already sold out of the whole box he just received, or maybe he hasn't updated the listing.

Bitmain built in a way to adjust voltage in software but the info on it isn't really available.

https://bitcointalk.org/index.php?topic=1504228.0

Requires a PIC programmer and will definitely void the warranty, but it's not difficult at all.

Hey, that's interesting and I had no idea it was going on. I'll have to stary paying more attention.

You know, if you undervolted that you could shave probably another 70-100W off at that speed plus undervolted like running warm for stability which means lower fan speeds.

I believe it's an arrangement where power is a three-way split in a shared (and over-airconditioned?) office, so he's only paying one third of the miner's power cost but has practical draw and volume limits and benefits from the output heat.

ASICPuppy.com has stock

I posit that, if they offered a longer warranty, they expect not to be losing money, but to not be profiting as grossly as they would prefer. You said it yourself:


It's basically impossible for Bitmain to be losing money on their miners. They have moved how many thousands of S9 at $1600-2200? The mechanical tooling costs are almost zero since they use the same extrusions as S7 for both housing and heatsinks. ASIC costs are high, but even if we assume $5 cost per chip (and they could profit from raw chip sales of BM1384 at $2.50, what's 16nm cost vs 28nm?) makes $945 per miner so let's be generous and give it $1100 in materials. First batches were 100% markup, now we're down to only 50% or so. Material costs on the R4 would be a bit higher in tooling for the new case and fan, but at $5 per ASIC we're looking at $630 and the engineering for boards is next to nothing since it's probably the exact same circuit as S9 but with a slightly different PCB layout. So if we generously assume $800 materials that's only 75% markup. At that point you could replace one board in every R4 sold and still draw about 20% profits.

I've seen probably 30-40 S7 come through, plus 15 S7, with one dead board, and that was on an S7 which had been resold on eBay and returned a month later as defective - given it also had a fan failed, I suspect the buyer took dead parts from a batch, assembled them into one crap unit and scammed to get his money back. I have also seen so far 14 S9 with two failed boards, not quite the rate these guys are seeing but some of them were just delivered last week. Both of those boards failed inside 48 hours of runtime.

Miners should probably be built to run at least 18 months, especially if they're going to be priced at 14 month breakeven. If miners were designed to run 6 months they better cost about half as much. If they cost the same as they do now and actually could be called "overdesigned" I'd say they were priced about right.

Unless the cables are sturdy enough for splitters, which if they're 18AWG on the PSU I wouldn't trust it too far.

Yeah, a wider node is better for stability since differences in voltage based on difference in current draw through the chips is averaged out. Worst part of a string is the weakest link issue where the worst-performing chip sets the voltage for the whole thing. That's why there's so much bottom-end performance variance in undervolted boards.

Which, one of these days I need to get ahold of some S9 enough to work on a good snap-in undervolt solution. I suspect it'd also work on this R4 just as well.

Initial testing on the Molex adapter board looks good. It's currently drawing about 18A off the 5V rail which is good since I intended to give it a 15A rating. A little airflow goes a long way too, just saying. Tomorrow I'll test how well it handles the heat of that much 5VDC conversion while drawing about 20A of 12V through the PCB.

I'm glad it's working well right off the bat. Maybe I'll put up pictures tomorrow.