Topic: Bitmain Antminer U2 - page 5. (Read 26263 times)

   I don't think BFGMiner recognizes the Icarus values any longer. It just ignores it. Once you get up to 4 AMU's running together BFG will run for a few minutes then bumps up the minimum diff to 4 and after about 20 minutes it will automatically increase the que also.

AMU0 = U1
AMU1 = U2

Using:

0A81 drops off lower than these settings... :/

I can't get a stable hash 0A81...I'm not sure if it's my Hub or what; I'm still trying. I can get it to pulse 2.5 then it drops off. I'm going to compile CGminer 4.2 for win later today and try that. I've been on the most recent BFGminer.

What's the verdict?  Will it hit 2.2 or 2.4?

I'll test it right now. I just got a new hub that should power it enough for 0A81...I hope :/

I should have mine in a couple of days.  I'll see how far I can push it with a USB3.0 hub (more power than USB2.0 hubs).

Got somebody better settings for the U2? I know i can put it up to0A81 for 2.2 but i think for that my usb hub is to weak. tryed it and my errors went from 13% to 70
That is a U1 config i found i just put the clock rate from 0781 to 0981 (2GHs)

Yes sir. That is all it takes. Cheap small effecient and grauls like a big guy. If you need help with the setup or the soldering let me know, i helped a chick before over webcam how to solder her A/C conroller module. (haha that was a funny story). joke aside I got a TeamSpeak server for my biz to talk to clients all over the world.

No problem
Enjoy your U2 - StickMiners are awesome!

I couldn't find the exact specs for my motherboard, but I found people using them in notebooks and pretty basic PC's directly so it should be a non issue. In addition, I just ordered my first Antminer from jonesgear! For anyone curious they are on sale for $23 with free shipping from jonesgear, the second cheapest I could find was $26.95 on eBay. Thanks a lot for your help Steve, I appreciate it!

Check the specs of your USB ports.  The specs for the U2 state 2.95W @ 5V / 2GH/s, which is almost 0.6A.  That's technically outside the USB2 spec, but many USB2 ports can deliver more (since cellphones and tablets are rather power-hungry).  USB3 is rated for a much higher current, but your motherboard manufacturer may differentiate between data ports and 'data+charging' ports.  Even if you do end up needing a powered hub, you can pick one up at pretty much any big electronics store for cheap.  Btw, if you're in the U.S., jonesgear has some U2's on discount now.

Quick question, can I just plug one of these into a USB 3 port on my motherboard or is a powered hub the only way to go? I'm only looking to purchase one at the moment to experiment with. Thanks for any help!

Oh wow, not impossible. Yes, a complete waste on a PC - 700mA are nothing, damn that's good. Thanks!

Why worry about the pi. As I read before, mining is gpu intense, cpu is irelervant. Just get a pi. Dont bother with special destros just put rasperian on do your upgrades/updates solder the display together (is easy) get the instructions from adafruit for the I2C stuff and cgminer. Put the display and cg in autostart boom done. The pi runs on 14% cpu load on day 2 now. I think its a waste of money to run this on a pc. Pi eats 5v 700mA

Beautiful!! I am worried about using PI, this is my first time; I still need to get the LCD.

Also, try and mess around with scan-time, queue, and Expiry to lower your HW:

-Q 2 -s 20 -E 50

• --queue|-Q    Minimum number of work items to have queued (0 - 10) (default: 1)
• --scan-time|-s Upper bound on time spent scanning current work, in seconds (default: 60)
• --expiry|-E   Upper bound on how many seconds after getting work we consider a share from it stale (default: 120)

You can add these commands at the end of your shell string:
Also, keep in mine many pools have different Strategies:

• PPS - Pay Per Share
• PPLNS - Pay Per Last *N Share
• Double Geometric - PPLNS + A Capacitor You Charge With Your Shares -- https://bitcointalksearch.org/topic/double-geometric-method-hopping-proof-low-variance-reward-system-39497
• BPM - Slush's Pool -- https://en.bitcoin.it/wiki/Pooled_mining
• P2P - Peer to Peer

P2P pools automatically set your work to restart after 10 sec - thus, setting -E to 8 or 10 would be most wise.

Currently I am experimenting with a massive Bitcoin-Blockchain spreadsheet and these parameters; to see if I can improve my miners locally and my quality of shares globally. I will share once I get some nice results; if they differ from the norm.

https://www.youtube.com/watch?v=k1mU4F4CS34 Here a video of my first Bitcoin setup. The error rate is 13%

I just started coupe days ago. As I said before I love the Raspberry Pi made from XBMC, Game Computer with NES, SNES and PlayStation one Emulator to my Baby my Quadro Copter Drone. (Better then the cheapy Drone to control via smartphone.)

I like to learn more about the Bitcoin Stuff.

I am about to build my Pi Miner today, my Hex Miners are getting too hot in my outside room. Nice job btw! For Error suppression try different CG builds (I heard the new release lowers the % much more); also try older ones, maybe even BFG. Otherwise alters the scantime, queue, and expiry can help a little. Your total HW should be 5% or lower on high clocks. Keep the temperature low; just cut a 12v .5A (1.5 depending on Fan) A/C adaptor and splice it into a Case Fan; throw the miner in a box and you're set. I operate between 94 and 100 F.

Look at the chip on your U2 - It will say 'ANTMINER' and below it will be the batch number; this will tell you if its U2 or U2+.

edit: spelling //Pics:

Replicating an HVAC 'Return Air' system. Contrary to a 'Tower' blowing air on a board inside of an enclosure will just move hot air around. You want to 'Pull' cool air from the outside through the enclosure - making it near air-tight will ensure for a closed 'loop' and maximum CFM (In HVAC Theory - as you can see I lose 20% [edit: I have 80% lose 20%] of my air pressure, but it works just fine. If you have Central Air in your home look for your Air vents on the ceiling and then look for what is known as the 'Return' its where you have to monthly change the air filter. This is was creates a circular air-flow and allows the cool air to continue to circulate by creating an artificial pressure system in any room.


Built & In Place

Inside - Removed the U2 for testing for this Thread

Add Heatsink's to all U1's - $3.00 Ebay for a nice bundle

Where did u buy that LCD for the raspberry pi? is hard to install? thx

edit: ok its adafruit, found it

I have my u1's running for a long time now and I am starting to smell solder.
Anyway they are still working, so I think the u2's can get pretty hot too.
If your antminers are clocked at 1.6GH/s they are U2.(you have to overclock them first)
If your antminers are clocked at 2.0GH/s they are U2+.

dont know if that is u2 or u2+ how to find out? Plus how do i supress errors? As i said still new in the game. Plus how hot is good? Right at the sec that thing is so hot that i can leave my finger on it for 5-7 sseconds before it starts hurting. i know that is not accurat but i dont have a thermometer laying around