Topic: Bitmain Antminer U2 - page 6. (Read 26263 times)

Just rumor from one of my technician...
U2 can go up to 5GH but compressed to 1.6-2.2GH because theres not enough power from USB. In a way U2 is undervolt version from its original...

OK the last picture was taking 1 minute after boot. I want to show some ledgit stuff this picture I took 20 later. I am pretty new to all the mining stuff but the raspberry pi is my friend since it came out. Linux for life;)

That is my mining.......well dont know if I can call it a rig XD
Got the U2 hooked up to it and run it on 0981 (2GH). The pi is setup in a way that u dont need a monitor or keyboard for normal mining operations. Just plug it on a android charger. Done. Put cgminer together with the i2c compiled software in autostart. Made it plug n play
I bought on u2 just to see how well it des without fan. well i ordered 20 more.

It looks like you hit it head on! My U2 is day's running, non stop and I am grab them. Their ability to deal with heat will give them the long lifespan they need. However, with the U2+ it looks like almost nothing. This reminds me of the story of the Nvidia and R9 war; AMD's FX-9590 can also be seen this way:

A company will develop a new processor, during the manufacturing process four main (there are more I believe) triage categories are created for the new processors. Call them, Lo-Quality, Med-Quality, Hi-Quality, and the forth, 'Failures.' The releasing company will benchmark each chip. The chips that fail to meet their minimum requirements are discarded or put to scientific use (some how - I hope). The Lo-Chips are then put into, let's say, The R9 270x, and the Med /Hi are held. As soon as Nvidia releases their competing GPU with a comparable processor; AMD is already ready with their Med-Quality Chips, they package them up nicely, add some ram and cooling and a 280 is born. [Note: This is not the case, it actually happened with the generation before the R9 but I get confused with the numbers, and can't remember the exact models]. Now if we look at the FX-9590, it is the same CPU as the FX-8350 but capable of reaching 5.0GHz. This is because these chips preformed above their standards - they actually are better and faster, but their architecture is identical, hence the reasoning behind more cooling (the stock Liquid Cooling you get).

My point is, a chip is a chip. Silicone is unpredictable and better ones will be born. Can the U2+ be just the high quality chips repackaged, why not? Are they, I have no clue. .I'm going to follow your test and replicate it to see what data I can come up with as well.

Thank you for providing your parameters.
I did some tests, my goal still is to find out the difference between U2 and U2+.
So I plugged an Antminer U1, U2 and a U2+ into my computer and started BFGMiner (3.10.) without special parameters:
bfgminer.exe -S antminer:all -o stratum+tcp://POOL:PORT -u LOGIN -p PASS

After 6 Minutes of mining this is the result:


So I started again with additional parameters:
bfgminer.exe -S antminer:all -o stratum+tcp://POOL:PORT -u LOGIN -p PASS --set-device antminer:clock=x0981

Again the result after 6 Minutes:


AMU 0 = Antminer U2+
AMU 1 = Antminer U2
AMU 2 = Antminer U1

When running with clock x0981 the only difference seems to be the non-existend hardware errors/rejects. Regardings the temperature I did not "feel" a big difference between them (which can be because 6 Minutes is not that long time). But actually I think there is no big difference between those miner versions, or do I misunderstand something?

1)Open notepad
2)Save as FileName.bat (you need a .bat file format)
3)Save it in the same folder as the .exe of cg/bfgminer
4)type:

Bfgminer.exe -S antminer:all -o stratum+tcp://address.com:3333 -u username -p password –set-device antminer:clock=x0981

5) save .bat again
6) double click and run

Also, you can use amu:all or different clock settings

I also add -s 20 -q 1 -E 45 for Scantime, queue, and Expire (i think it's capital E, sry I'm on my phone). These settings are for rapid Accepted shares of low value. I'm working on a setup for slower high-value shares. Depends on your pools method. I may have one character off in the command line, of it fails just open up the readme in bfg's root

Personally, I like to add as echo to the beginning of the file:

@echo off
echo loading AMU bitcoin miner...
Bfgminer.exe .................

Could you please explain how you start cgminer/bfgminer and if you are using any special parameters?

Edit:
U2= 1.6ghs stock
U2+= 2.0ghs stock (it appears!)

I have a U2+ on pre-order, it looks like the U2 efficiency (ghs/watt) was improved. They kept the same 2w consumption but increased the speed. My guess is that their upgraded the quality of, or added a different or additional part to the board (ie: oscillator, reststor, etc). There are several clear differences between the U1 and the U2 board, but I'm expecting a minute difference between the U2 and U2+; however, this could make a world of a difference in Overclocking


If anyone could get their hands on a Data Sheet for the U2+ that would be amazing. I have to say the U2 really makes a difference in HW's; I fine tuned mine last nite and I'm at a stable 2.16 with zero HW (x0891), and that's local; my global rate is 2.60

Maybe I am mixing something up, so I hope you can clarify this:
When starting bfgminer/cgminer without additional parameters to set the hashrate (like "clock=XXX" or "--freq") Antminer U1 and the first version of the Antminer U2 (with the new heatsink) started to mine with 1.6GH/s per default.
Since the new Antminer U2+ is advertised with 2.0GH/s per default I expected they would start hashing with 2.0GH/s without adding parameters.
I know that I could add parameters to change the hashrate, but this was also possible with the U1/U2. So I am wondering where the difference is between the U2 and the new U2+

I dont understand something. I bought 2 antminers also in cryptoware, and u2 are supposed to be 2GH/s base(1.6 its u1), so how can yours be 1.6? if its U2 version cant be less than 2GH/s

Since no one did reply I sent an email to bitmain asking about my current order.
Obviously additional parameters (--freq 0781: 1.6Gh/s / --freq 0981: 2.0Gh/s) need to be set to run it @2GH/s. I am just wondering where the difference is to the previous U2 batch. Does anyone have an idea?

Did anyone else receive units from batch 0331 (U2+, 2.0GH/s default hash rate) yet?
I am wondering that mine are also V1.2 and only work with 1.6GH/s with default cgminer settings (just like the previous U2 batch).

Yes, I run a series of them inside of a 12V AC adaptor with a nice Corsair CPU fan cooling box. The U1's run max at 101C, but the U2's on my set-up so far run around 94C. As soon as I find a way to push above 2.2 with cooling and command line I'll post it.

Ok thanks so 2.2 max recommended?

I love the U2, I just use the bfgminer command in a .Bat or .Sh file.


Hex=Gh/s
---------
0581 =1.2
0681 =1.4
0781 =1.6
0881 =1.8
0981 =2.0
0A81 =2.2

It goes higher but i start getting high HW after 2.2.

Other than that, I would love to know of a Hardware part swap-out guide to get closer to 3.0

Hi. Is there a tutorial of how to overclock this antminer U2??

Other than the spacing issue I'm having with u2...If I find mine doing wierd things. Do I just return to the place of sale or is there a better option[for r/d of the developer]?

I have a u2 that doesn't like the hub I had an old eroupter on(USB3 aitech) and won't work (red light with no green light), but if I plug it into a different hub which happens to be a rosewill 4amp 10 port hub usb2.0 with about the same connections it goes upon its happy way till I catch cgminer deactivating it and then I use the unplug setting and off it goes again. I gave it a wide berth on both though atleast the aitech has enough space between if I get the opportunity to buy more or iqnore higher hashing devices available.

Also notes for u3 ... Make a red blink on problems or have some sort of cgminer feature to blink a device so its easier to trace down whats not playing nice. At least my readynas device has this feature if I ever have that many nas's I can't count. The red light does nothing for me on the u1 (solid red) and at least the u2 does like the block eroupters and does a [blink blink blink solid] on the top green light when you first power it up.

I used the standard CP210x_VCP_Windows driver.

Is there a new driver for the U2?

a) It's for fun, use the right SHA256 altcoin at the right moment, and you might just shorten that ROI a lot while having good ol' fun.
b) OC'ing them can be fun too.
c) You will get some BTC out of them, and if the BTC course does another big high, well.. Then you're one of the lucky ones with a BTC in its wallet when its 2000$ each

Mining is speculating too, remember that