same thing on my stats page - most (but only 12/15) miners are showing about 20-30% slower speeds. My single bitfury unit looks unaffected along with 2 antminers. the other antminers all sit about 40GH less. hopefully this is just stats-side in which case I can deal with it for a while like with the fail-safe - but it would be nice if there was an objective way to check the pool hashrate (blocks solved on blockchain might show this, but would need 3+ hours of data to be remotely close to an actual average)

There is not much reason why a single person or very small group would go to these efforts against you for such a long period - the goal unless its personal against you just isnt clear in terms of benefit to him/her/them

A government entity makes no sense. They have very little to gain from destabilising a mining pool if it is not actually directly damaging the network hashrate. Thier attacks would be far more effective on trading or bitcoin news sites.

My guess is that some other pool is responsible. A pool attacking would work to shake loose eligius users to join other pools (presumably more stable, larger ones that charge larger fees - *cough*) - This theory serves a direct financial benefit to the attacker.

tl;dr  - There are are 3 likely suspects...

I paid $5 each   (but had to pick up locally)

why are they opened up like that? My advice for a simple non-reversible modification:
1) PS-ON : achieve this by using a tiny flattip to pop up pins 3&4 and bend them into contact with eachother. add a quick hit of solder to make this permenant
2) 12V & GND:  remove all the plastic around the outer two slot connectors (the middle one is more complicated so just leave it be). this will leave 6 pins easily accessible for both 12V and the GND slots, and you can jam in as many wires as needed and have lots of points of contact for soldering. (hint: 100W+ soldering iron is needed or it will be extremely frustrating when nothing melts or sticks)

could not handle 19kW of power? how small is your data center?  (I was running 4kW in a 1bdrm apartment with 2 windows half-open and it was comfortable temperatures (noisy of course))

what happens to the other 40TH of equipment that is in this 'phase'? and the 140TH more after that?

Its worth noting that whent he S2 Batch 2 first went on sale, BTC was significantly higher (I think it was only ~6.2BTC when i ordered). Makes the price comparison more reasonable.

Also, it seems like the S2 can achieve 1.15TH/1.25kW without much more than an extra PSU wattage. If so, you now have the same hashrate as 6xS1, but for about 1.1kW less power consumption

I appreciate seeing the voltage/speeds/wattage results posted for these sort of mods, so tip of the hat    For me at $0.15/kwh it makes more sense to run all my gear at full tilt (under 0.7% hw errors of course) for at least until the start of summertime

My guess is that less than 50 units were in batch 1. It sold out quickly and as of know I think I have only seen a half-dozen or so confirmations of delivery, some of which were users that received 3+ units

what else is known? pictures? will you be able to test them yourself soon?

sounds about right then - the S2 is basically 10 S1 units running at clocks similar to your current ones (ps: why dont you run your S1 at stock clocks right now - You would be making a lot more profit then with your underclocked speeds)

A small pencil mod to increase to S2 voltage should make >1.25TH possible. The PCI slot seems to use mutliple pins on a common blade of the cards to provide voltage. It looks pretty good method, and it *might* work with a ribbon cable, but a fat pair of 12AWG wires to carry the voltage would be the best way

MrTeal - what sort of temperatures does it hit at 225MHz - did you modify cooling?

check the overclocking thread. There will be two resistors associated with the output voltage of the TPS53355 regulator. using a pencil mod on one will increase voltage and pencil modding the other will decrease it. Figure out which one ups the voltage and go to town - 0.9V will probably unlock ~1.25TH/1350W.  0.95V might be sufficient for up to ~1.35TH/1.6kW  if you can cool it a lot better then stock

I have a server PSU im currently getting ready to handle lots of PCI connectors. I would love to see more photos of the PCB, since at least the TPS53355 regulators seem abundant enough that overclocking should not be a problem for them. The design is pretty simple other than that for a S1, so I imagine the S2 is similar which means OC/OV should be the exact same methods but very successful.

Those heatsinks would be a lot better - if you get them made let me know    I would suggest not having too many fins, because the S1 heatsink is a jagged dust-trap because of how many fins it has

Im a batch 2 order, and if noone overclocks it first I might have to take the plunge. Should be lots of headroom in the components, but it may be necessary to use some sort of powered (with 12AWG wires) riser solution to get the boards up out of the case for better cooling

The orientation looks like it would be blowing down? (up makes more sense for a thermodynamics POV)

i considered something like that, but i dont know why the airflow is pointed down - thats the exact opposite of the 'heat rises' concept that would make blowing all the hot air upwards more effective

wow - i was trying to clarify that he needs not be so aggressive about his argument, even though i 100% agree with the fundamental point of it; which is that this is an odd form of contract to get into by giving hundreds of dollars to a forum member in the expectation that 2, 4 or 6 months from now it will still be enforced even when you are only making a few dollars to run all this equipment for people despite having all the money up-front weeks or months earlier.

I just want to make sure people all keep caveat emptor in mind - the internet and these forums in particular have claimed a lot of scam victims in the last few months and anyone interested in your hosting should make sure they understand all the risks involved before blindly investing 100% up-front.

Your response seems out-of-line. it did not answer any of the questions or concern raised, and brushes them off as pathetic trolling. I run antminers myself, they are great machines, but I would never ask someone to pay several months of hosting up-front for a service where you are inexplicably getting free electricity

it sounds like it is expected to take a few weeks to reach 100TH, and another month to reach 200TH. That means about 5TH is to be added per business day if all goes smoothly

I dont have a convenient photo, but i basically just bent the PS-on pin towards the GND pin beside it, then left a very small dot of solder to keep them connected so that when given AC power, the DC automatically triggers on after a 0.5-1 second pause (presumably charging a capacitor?).  I then snipped away the plastic on the GND and 12V sockets (i left the middle one alone since it has pins for both and i didnt want to much that up somehow). \

snipped away the plastic, bent the 6 pins/socket outwards slightly, and jammed in my wires and a TON of solder to make sure everything was sealed tight. You'll need a 100W+ soldering gun to do this, otherwise you'll be sitting there for 20 minutes trying to even get the solder to melt against such thick connectors/wires.  150W soldering gun makes the task a lot easier

mining is fun. how many people buy a $200 box of lego, spend 2-3 days assembling it, and then put it away on a shelf as a decoration? setting up computer gear is fun for some people.

you can blow $1000 gambling for a few hours of fun in vegas and walk away empty-handed.  Some people like me would consider bitcoin mining as a bit of a hobby, particularly one that can make a bit of profit if things go well. not many hobbies make any money.

also, mining depends on your outlook on BTC. do you see it at $1500 or $150 by the end of 2014? Its going to be at one of those extremes, and my money is on it going up (literally). I don't think its hard to envision a near-future where huge facilities hosting 10-20PH of power are located all over the globe, run by both private investors and/or banks and investment firms who want to produce their own bitcoins.  If bitcoin continues to be the leading solution for a future-proof currency it will be very valuable in 5 years from now

50/50 makes sense. That hopefully is enough that the re-investment is sufficient to maintain a constant bitcoin income by increasing the hashpower at roughly the same rate as difficulty rises.

it took a few days to get to 10TH. I cant see 100TH being deployed in any less than another 5-10 business days (it probably takes a full day to load up a rack, and get 20 boards wired and cooled properly for another 10TH - this estimate would be for 2-3 people working together) In order to actually have 100TH by the ned of next week would likely require 4-5 people working together 8hrs/day

Has nobody overclocked or overvolted an S2 yet?

640 chips (an S1 has 64 chips), 16 chips per TPS53355 regulator  (S1 has 8 per)
S1 was forcing around 30A through the regulator at stock speeds, and up to 40A with overclocking and some overvolting (based on some of the 210GH+ reports in this thread)
S2 is putting about 22-24A on the regulator at stock. Presumably with a bit of voltage modding and overclocking the regulators could handle up to about 1.4TH/2kW

only issues:
1) power. To seriously overclock, adding a 600W+ PSU will be necessary
2) cooling. More fans and/or individual chip heatsinks are necessary to properly exhaust any extra heat since the units read 50C+ temperatures stock
2b) PCI entenders. Looks like the boards are all mounted using PCI (PCIe 16x?) slots. if you used some risers (with a nice pair of 14AWG power cables to protect the risers) you could get the boards up out of the case and arrange them with airflow directly aimed at the heatsinks for better cooling.

I can't wait for my batch 2 unit to arrive - if noone overclocks by then I might have to be the first. (donations will be accepted in case i kill my miner :p)

I know a lot of people are calling you a troll for constantly posting, maybe it is time to back off a bit and let this run its course?

I agree with you, this is an odd deal. Its a very long-term hosting that has pretty tight profit margins for btcmin0r1, particularly after the first 2-3 months. There is a definite incentive for him in that he keeps the gear at the end, but as mentioned it really requires FREE power for him to make any real gains from this, and also there is nothing holding him back from dissapearing after paying 1-2 week's dividends and then re-joining with a new forum id that is unscathed.

but even if legitimate, the free power is a big concern. Ive considered selling shares of my own 3TH+ setup, and would not do it at the rates charged in this thread (partly because i do pay for power). having almost 6kW of power draw raises red flags for whoever's power he is using, unless it is being 'borrowed' from a private entitiy such as a school or a business (either owned by btcmin0r1 or a close friend so that power is a part of that business's expenses - which is illegal if you were to ask the IRS). Otherwise, he is stealing power from somebody or his landlord who is going to catch on fast when power bills go up by $300/month

I won't say its a scam, but i will urge people to be cautious and do their due-dilligence before they invest money