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For those interested:
Ive succeeded in pencil voltmodding my S1 ... after a days worth of digging through the PCB spec sheet from antminer and not knowing hardly anything about electronics... I dared to try.... =)
So far, its not blown up and Ive modded each of the 8 "modules" on the S1 successfully.
This has been tested only on the December version of the units, after studying differences between Dec/Jan units...not sure if this works the same on Jan ones.... but should.
RESULTS:
Stock:
1.11v on chips measured on top portion of the modules
400mhz @ 1.8% HW
Modded:
1.15-1.18v measured same place, consistency is hard to get w/ a pencil so.... there is some variance between modules
400mhz @ .002% HW
Temps rose about 5c and fan spins a few hundred RPM faster to compensate.
Power also increased by about 25-30w measured at wall
Further OC results are not in yet, thats next on the list.
For now I am keeping a close eye on voltages / temperatures VRMs & ASICs - all seem within good spec
Ultimately hoping it wont die over the next few hours...
ITEMS NEEDED:
voltmeter(that can measure resistance) & pencil
METHOD:
Before proceeding get a ballpark measurement of the chips on the "modules" by doing this:
Make sure voltmeter is set to VDC measurement!
Put negative voltmeter probe on the "GND" contact on the first module
Put positive probe on the bottom side of the orange square component thats in the middle of the "module"
Do this for all modules and note.
Stock they should be right around 1.10-1.11v
NEXT..THE MOD:
Power off the antminer completely!
When looking at a "blade" ... the left most "module" will have a resistor labeled R12.
Measure its resistance from end to end w/ voltmeter, it should read around 4.4-4.45k
Now, take pencil and scribble on top of the resistor from end to end... probably around 10-15 light strokes
Measure the resistor once again ... our target is 4.25-4.3k
If its lower than that, take ur finger and using finger tip skin, swipe it downwards across the resitor.. lightly
Measure resistor again .... if took too much off (back to 4.4 or in the 4.35k area)
Then apply more pencil....
Repeat this process till u meet target of 4.25-4.3k
Once this resistor reads correctly move over to same resistor on the next "module"
Once an entire blade all reads similar target resistance .. Turn the antminer on.
During its bootup process measure resultant voltage by doing this:
Make sure voltmeter is set to VDC measurement!
Put negative voltmeter probe on the "GND" contact on the first module
Put positive probe on the bottom side of the orange square component thats in the middle of the "module"
Do this for all "modules" on the modified "blade"
The voltages so all be close to 1.15-1.17v
Anything higher than 1.2v .. IMMEDIATELY power off the antminer.
If all is well, then you can proceed to the other "blade" on the antminer.
POST METHOD:
Monitor the temps of the antminer, I use finger test method of VRM components ... note the temps of individual components on top of each module .. if after the mod they are scorching hot to the touch and immeditely can feel them "burn" ur finger... well, thats too hot for my comfort ... so may want to undo the mod.
Also, note the difference in feel of temp of the chips before / after mod ...
The hottest VRM / ASIC is gonna be the furthest from the fan ...
Optionally can run the voltage a bit lower on these modules furthest from the fan too... =)
Results should be similar, significantly lowered HW error at same clock speeds before mod. Therefore allowing you to eventually clock it higher ... once you have confirmed the unit is stable and running within temp spec ... for at least a day or 2 I say.
Its all risk so, its up to you of course =)
* HAVE FUN! BE CAREFUL!
** I cant be held responsible if you blow up ur shit!
*** POST RESULTS!
TIP: the little VRM heatsink packs I see being sold on ebay for antminers would keep the VRM's very comfy for a mod like this! I would recommend this for attempting anything thats 1.2v+
The pencil mod can easily take ur antminer into the 1.35v range w/ a solid amount of graphite applied... but u would need SUPERDUPER cooling on that puppy! HIGHLY NOT RECOMMENDED!
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Man, I was hoping something a little more lower price wise for the S2. At nearly $4k or over 6 BTC won't ever ROI.  Yeahp, only a significant increase in BTC price will allow the BTC amount to come low enough. Why BITMAIN decided to peg prices to USD is beyond me.... |
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I wonder how low the clocks have to be dropped to reach the target voltage to stay at 1W/GH....
if its half the speed to meet 1W/GH, then each machine will have around 640 chips in it...
Which means S1 could be sold for half the price they are asking now. Based on chip density.
I wonder how easily the S2 will be oc'able ... knowing that its chips will be severely undervolted.
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Does each antminer need its own PSU? Or can they share?
I set up a share: 3 ants with 2 dell 750 total of 6 blades , 3 blades one dell and 3 the other, and oc to 375mhz no problem and another setup with 2 old dell psu from desktop pc connect to one s1, these old dell psu have 90% or better efficientcy and cost almost nothing as long they have 20 amps at 12 volt one can use for each side. They dont have 90% effeciency at least in my exprience. My gold 750W PSU's get 30-40W less per antminer than the dell server PSUs .. nonethless the dell and HP server PSU's are a great value! |
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BITMAIN if you read this thread, please get back to me regarding my order ASAP. Its gone horribly wrong and need assistance.
Sent PM and emails to both email addys listed on ur site!
Thanks
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I wouldn't mind that setup, but I wonder if he has paid off all those rigs yet! Those boards were going for a lot of money each not too long ago.
This is dave, the guy that was fuckin distributing them ... he probably got them at an insanely cheap rate. Probably skimming them off customers preorders too! |
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Antminer s1 was running overclocked fine for month or so and then just stopped...it gets online and all but mining status page doesn't show either of the boards. the area where the two chains show the mining chips is just empty! I tried unhooking one side and even switching control board to the opposite side and just power that side but no luck on any front. No idea what to do next.
Well, if ya cant figure it out, there is a 90day warranty on these things afaik... |
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The difference between the S1 and S2 could be similar to the difference between the U1 and U2. Same chip but with hardware and software based optimizations to improve performance.
Yeah thats what Im willin to bet on. Same chip, optimized hardware around them and perhaps more chips.... =) Would be nice if VRM's were beefier and voltage control could be done easily =) |
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Since I never got around to learning vi and manage w/ nano ...
You can install nano via the webgui of antminer ... under the software tab
Update the lists and then search for nano, it will show up and hit install.
It will hopefully say successful, then in ssh session you can just nano /etc/config/asic-freq or /etc/config/cgminer or /etc/rc.d/S99cgminer
=)
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Beside the heatsink they look like the u1. can not see any improvement.
They will be overclock able out of the box- no need for changing any resistors. The U1's are overclockable too.... Do you mean to say the voltages...etc... will be easily changeable via software? That would be fucking awesome! |
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In the midst of all the shit happening recently, I thought it would be awesome to point out this reference made to Bitcoin in today's episode of TV series "Justified" (an amazing show btw =P)
It can be seen / heard starting at the scene w/ timestamp of 17:45
Thug w/ gun pacing the room, pressuring nerd on PC: "How long is this liable to take?" .. Nerd: "The money is in Bitcoins, iz moving around online you know, covering the trail" .... Thug: "That is not an answer, .com" ... Nerd: "6hrs maybe 8 before I can turn it into cash" ... yadda yadda
I was like YAY!!!!!!!! when I saw / heard this. Completely unexpected!
Hurray for bitcoin!
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I dont get how this is positive...lol |
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yeah, these are priced WAY too high at this point.... Im waiting for price drop as well.
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my god, feb 28th ship date and the price hasnt gone down further?! ... yeah....thats not cool... hardly will ROI
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thats not really amazing news at all.... 1600PH?!?!
You realize, he just put the rest of all us miners out of fucking business. Yall should be outraged...not jumping up n down with joy!
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So, does the auto coin switcher pool, just royally suck? Or does it somehow avoid my miner from connecting when its on high diff coins , like PPC & BTC (to avoid potential never finding a block?)
Cuz it seems my miners are routinely on my backup pools when coinex is mining PPC or BTC...
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is it just me or is the mining very unstable ...? I get constant disonnects like every 5minutes sometimes and I notice the pool hashrate plummets too, in the stats...
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Remember that if these antminers are already mining on the network, then when we get them the network difficulty won't be changing much. Which is good for us.
Yep, thats one positive of all this =) ...if thats the case |
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Lots...  LOL, that picture is much less than a minimun of 1284 antminers ... |
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