I'm smack in the middle of the US. As much as I like whole miners, distance and border crossings are gonna make weight really hurt so yeah I'm fine with just hashboards. Those are the things I'd get immediate use from anyway, and it's not like I don't already have 40-50 S-series cores laying around already.

Get a count, drop me a line and we can start talking numbers.

The new Terminus is definitely better, but I'm still having issues at higher power levels. My test board is sitting comfy at 150MHz (66GH) 26W including fans but it doesn't like pushing higher than that without locking up the string - usually that means voltage sag. Hopefully it's something that can be ironed out without another PCB redesign.

Okay, but I'm not gonna be interested in anything but S5 right now.

I am in need of S5 miners for chip harvesting. I will trade one GekkoScience 2Pac USB stick (up to 35GH with a stout enough hub) for an S5 hashboard in fair condition. Entire miners (fans, heatsinks, what have you) I'd take for cash or trade which includes credit on a forthcoming 8xBM1384 pod miner good for about 100GH/35W up to 140GH/60W.

If you're looking to clean your closet, let me know. I require many.

May be too late to be useful, but https://www.bitshopper.de/shop/accessories/gekkoscience-12-pole-pci-e-6pin-breakout-board-for-hp-dps-800-und-hp-dps-1200-psu/?lang=en

I've often thought it'd be handy to pipe my exhaust heat into a greenhouse or something so I could have fresh corn in January. Though realistically my shop leaks so much, it was all I could do to keep the place warm with miner heat and didn't have any to spare for vegetables.

That regulator is the one that's being replaced on the new version. VH and I both have hacked-up boards with external main regulators spliced onto them so we could experiment with drivers and such at full hashrate because the onboard was by no means robust.

It should be able to run 100GH without a fan, off a 12V 3A brick. It'll sure be toasty. The release version will have an overtemp shutoff set to 80C with a temp sensor in the middle of the chip field right under the heatsink.

You did notice that's the "instantaneous hashrate", not the steady-state, right? At 325MHz the average hashrate is 143GH. If you can push one to 450MHz without it melting down (might be possible with "pencil mod" to the main regulator since the required voltage is out of range) it'd hit 200GH but it'd be pretty smokin' at that speed. Like over 100 watts kind of smokin'.

Jeez, 250GH would be almost 500MHz. That'd be smokin' hot. S1 hashrate is GH/s = MHz*0.512 (64 chips, 8 cores per chip).

But yeah, Terminus is basically an undervolted S5 chunk. Way better chips than the S1 had. Hopefully this week I'll have time to work on Bitfury dev some more because the BF Terminus will be able to put up almost 400GH at the top-end when it exists someday.

http://www.electricalbasicprojects.com/simple-555-timer-projects-fixed-and-variable-pulse-waveform-generator/

I'd try something like this, except wired up for about 135Hz. Shouldn't be difficult to find a 555 that'll run off 12V. Tie the output to the tach line (usually the yellow wire) on the fan jack. If I'm remembering right, fan spec says two pulses per rotation so 135Hz means a shade over 4000RPM. 150Hz should detect as 4500RPM. The controller will think it sees a fan present and spinning fast and loud.

Note that I haven't tested this in any way, it's just an idea that I think should work based on what I know about fans.

You uh, you sure about that? Top overclock for an S1 was about 205GH. A good undervolt would see something like 140GH from 170 watts or so. The Terminus here is probably drawing around 65 watts, so about one third.

Or did you mean 175-225MHz, which would yield 90-115GH/s? Around there, a good undervolt for S1 would see something like 100-130W I would guess (it's been about two years since I did an extensive study on S1 undervolting) and at those hashrates the Terminus would see more like 35-40 watts.

Nice. For the 2Pac and Terminus, that's higher frequency than I've ever run.

If you just had a dunk tank with a circulator inside it, you could put whatever miner you wanted in there. Pump your fluid out to a radiator in your basement or another exchanger in the pool. If that's too much pricey fluid, use a heat exchanger in the tank and pump water or something through it and out to the radiator. That's gonna raise the overall temperature a bit because you'll have two heat transfers instead of just one, so you'd have to pay a bit more attention when designing and operating to make sure it'd handle full power.

Depending on heat and how strong the 5V rail is, these guys should only pull about 0.8-0.85A at 100MHz. But that's still cutting it close for continuous use.

No, that will not be possible for a whole lot of reasons.

Just got shipping notification for the revised Terminus PCBs, only a few days after I expected to already have them in hand. So not too bad. Hopefully they're delivered by week's end and, double hopefully, the new regulator design works as expected.

Mayhaps my folks are not exactly typical, but I got my first multimeter for Christmas at about 9 years old. Never leave home without one.

Nope, it spins continuously.

Weird. You're sure you're using the latest Windows build linked to in the first post?