Is there a way to undervolt/underclock these devices?
If you SSH into the antminer using putty or a linux command prompt, you can edit the file asic_freq (located in /etc/config/ which controls the frequency the chips operated. There are several prepopulated values in the file... each option is a set of 3 entries you remove the "#" from the lines you wish to try and add "#" to the lines which will no longer be used, save the file then reboot the Antminer... I created a freq setting of 375Mhz by adding lines using the hex value "4e81" (in between 4d81(350Mhz) and 4f81(400Mhz) now my ant is running nicely at a solid 192Gh/s for a mild overclock.. Is there a risk of bricking the machine doing this, or will the controller still work (allowing further edits or restoring the old values) but the hasher not work? There's always a risk of bricking a unit when you play with configuration files, but the asic_freq file does not seem critical to the unit booting. I haven't experienced an error while modifying the file, but at worst, cgminer wouldn't start based on chip errors and you'd have to go back into the file and select values which worked. |
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Is there a way to undervolt/underclock these devices?
If you SSH into the antminer using putty or a linux command prompt, you can edit the file asic_freq (located in /etc/config/) which controls the frequency at which the chips operate. There are several pre-populated values in the file... each option is a set of 3 entries you remove the "#" from the lines you wish to try and add "#" to the lines which will no longer be used, save the file then reboot the Antminer... I created a freq setting of 375Mhz by adding lines using the hex value "4e81" (in between 4d81(350Mhz) and 4f81(400Mhz) now my ant is running nicely at a solid 192Gh/s for a mild overclock.. There is a blurb on this in the antminer setup guide. To answer your original question, you would underclock by selecting a chip frequency less than 350Mhz |
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Remember me? (Post #60) I filed 34 days after my order, when not in receipt of tracking information.   Note the e-mail address attached to the paypal account I sent payment to way back..... On the day I intended to open a non-delivery claim, which went straight to a dispute btw, I discovered this:  The above info is what tipped me over the edge to go ahead and file. Very glad I did. Some might say I should have put this out there a long time ago, but believe it or not, I thought these guys might actually ship something someday, so I kept to myself... sadly after watching 30 forum pages of WTF??? This is not the case. But I think it might explain Clenell |
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Fastest shipping I've ever seen from China and absolutely zero issues with the product. Extremely satisfied. Thanks BITMAIN and Sushi.
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Previous customer - In for one please
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Speaking of which, plug time: If you're really doing this put a simple 3ag fuse in series with your new power supply. Calculate it by the number of watts your unit draws (20 watts+15 per chip) and divide by 12. So a 5 chip unit is 20+75=95 watts/12=8 amp fuse.
That way you won't feed more current than that into a short.
C
That's good info!! I was wondering how many watts/amps I'd be drawing per chip as I plan on running more than just the two I have off of a 1000w ATX power supply. Now what would be bonus would be to find a PCI-E jack that lines up perfectly with the holes on the board for the adapter plug. I know the Singles used ATX power.... what is the interface between the single board and the PCI-E six pin jack on the case, or is it straight wired to the board? I've placed heatsinks on all the MOSFETS... Which component is the 1850.... I looked (albeit briefly) and couldn't identify it? As a side note, both my 6 chips have been running nearly 20 hours @ 23.5Gh/s with 1.5-1.7% HW errors (better than my chilis error wise) Still considering going to chip 7 and 8... but I'd like to have better heatsinking and power supply in place. The fuse is a most excellent idea and I intend to use it. |
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Please, please, please make sure you actively cool the 1850 & the MOSFETs if you decide to do this. The thermal plane on the board is really effecient and you will overheat both if you are running that many chips unless you have active cooling on both the top and bottom of the board for both the chips, MOSFETs and especially the 1850, which will cause intermittent and strange lock ups if it overheats.
How different is the Little Single heatsink from the Jalapeno's? Any chance we could procure some on the open market? What cooling solution is used on the Singles/Little Singles for the MOSFETS and the 1850's? I'd absolutely love to take one, two or more of these guys from a two chip solution all the way to a full blown little single. I have 4 more Jalapenos on the way from the black friday sale and 20 chips left to play with. |
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Payment received. Blades are sold.
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@Poochone, nothing heard.
Blades are still available.
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Sold - Poochone, please pm me your shipping address.
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So I got a little crazy this weekend and took both of my Jalapenos from 3 chips each to 6 chips each.  The results are below http://imgur.com/a/FzKPMIn the linked images, BFL3 and BFL4 are my Jalapenos... the others are Chilis The stock 6A adapter gave out after the 4th chip, so I cut the plug off and wired it to a PCI-E cable right off my computer's power supply. No issues with power after the mod. Adding 4 chips had both Jalapenos up to over 60C. The 5th chip needed additional cooling (up to 78C) and the 6th chip put the temps off the map. I found applying thermal compound between the aluminum heatsink plate and the Jalapeno board then placing an active cooler on top (running the Jalapeno upside down) provided exceptional results... Both are hashing over 23Gh/s Now I'm contemplating chip 7....  P.S Temps used: preheat the area with the wand for 10 seconds, then 90 seconds @ 460C with the wand 1/4 inch above the chip. The chip will float as the solder balls melt (DON"T FREAK OUT) as the remaining balls melt and adhere to one another the chip will realign itself. Patience was the key to my success. Sometimes it took a second heat blast to get the chip to recognize. Altogether I've placed 10 chips on Jalapenos this weekend |
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 So I have 5 blades that do not work.. The V1 pictured and one of the V2 will boot, but come up on the config page as all "X". The remainder just simply don't boot. The V2's were all modified using a 14.181Mhz oscillator and 124k 0805 resistors. The V1 was never modified from its original state. There is an extra network module for the V1. When I received it initially, it did not have the clock select feature. I wrote asicminer and they sent me one that did, so now I have an extra module. The one board without a heatsink is one of the ones that didn't boot. I had a need for the heatsink elsewhere so that one is just the board. You get everything you see in the photo. First reasonable offer over .25 gets all of the above shipped priority mail (US only) I'd be willing to send overseas, but they will go UPS and I'm afraid the shipping cost would be too high. |
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4.25 is more reasonable as that is what the Antminer S1 is selling for at this time. https://bitcointalk.org/index.php?topic=364342.0 The antminer has the same hash rate as 6 chilis, takes up less space and uses less power, and are currently shipping. I'd be in for one Sunzi @ 4.25-4.5. The antminer doesn't come with a power supply. |
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We never sold on the forum or to the forum members or tried to.. well no once we listed a few last minute available cancellations here... but that was it, and they guys that bought paid in btc and I assume came from the forum.
Check Post #77. AMT, I would have sang your praises had I received my box as promised. I'd have been happy to post videos, do a review, and all of the doubts here would have been eradicated. |
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