Quote from: Driveon on March 26, 2015, 03:59:18 PM

Quote from: MrTeal on March 10, 2015, 04:18:12 AM

Quote from: sidehack on March 10, 2015, 03:23:53 AM

Quote from: pekatete on March 10, 2015, 02:56:21 AM

Quote from: nexus99 on March 10, 2015, 02:44:28 AM

If spondoolies was ever going to do something now would be the time.

Makes you wonder whether they were spooked by the same competitor that bitmain were worried about ... but were they, like bitmain, brave enough to place firm orders to have their chips fabricated?

More likely they didn't want to invest further in manufacturing current-gen technology whose bottom-end efficiency is pretty much on par with current or upcoming competition's stock efficiency, so they could put money into R&D for the next-gen stuff to actually compete directly with whoever Bitmain's worried about in another month or two.

Additionally, when factoring longevity into S5 calculations recall that BM1384 chips are rated to run around 0.25W/GH with sufficient undervolt/underclock. That takes the S5 from a 600W 1100GH machine to a 125W 500GH machine.

Did you ever get further into your project to make a DC/DC supply for the S5? I haven't updated the firmware on mine since I got it to see if the issues with running at reduced volts was a firmware limit, but I'd be interested to know if anyone's actually gotten them down to 9V stable.

Hi, would be interested in getting these lower for Summer and longer. So a DC/DC supply would be great if the price works out.

Have a question, but let me start by saying that I know nothing about pretty much everything so forgive me if the question is stupid.

I have read that the undervolt/underclock is not stable. I am wondering is the issue possibly the controller board for these since they receive power from the Boards at a fixed voltage. Could the Controller boards not be getting enough power and that is causing the stability issues? Or could it be the fan drawing more power as the boards heat up?

I tested an S5 powered through a pair of adjustable buck converters a couple months ago. The claim that they will run @9V is bogus. I don't have the numbers in front of me, but 10.5V was about the minimum I could get it to run @100MHz... at ~40GH... and the efficiency was crap. At 11-11.5V it would run @100MHz, but no increase in efficiency.

I'd like to hear Bitmain clarify how/why they claimed 9V was possible. Can it be done with a firmware or config change? Some engineer miscalculated? Was it just marketing BS?