Topic: Bitmain AntMiner U1 Tips & Tricks - page 3. (Read 106808 times)

The Antminer S2 does not appear to have the same resistor configuration.  Has anyone looked into what would be required to increase the voltage?

I am not an electronics guru. I am a merely man with some soldering equipment and a willingness to injure myself and damage sensitive electronic equipment.

So pardon me if this is a silly question...

Am I to take it that by replacing the resistors per this chart we can increase the voltage and thus reach the hash rates beyond the published overclockable speed? (Which would presumably require increasing the ability of the U1 to dissipate heat.)


 

src: https://github.com/AntMiner/AntGen1/blob/master/manual/AntMiner-U1%20user%20guide.pdf

I am having a hard time believing it would be that easy but the ASICMINER upgrades were (after a huge thread of experiments by many talented individuals https://bitcointalksearch.org/topic/block-erupter-usb-overclocking-hacking-241652)

Pencil mod?

Messing with these U1's today, found an easy way to overvolt them... its a complete shot in the dark but....

I pencil modded the contacts where the R2 resistor usually goes (stock there is no resistor). Have no idea what the resistance is that I got to cuz the voltmeter I used to measure is shit as hell on resistance measurements...

But, I got the asic up to 1v doing this

Clocks seem stable at 300mhz @ hashrate of 2.4GH and HW of 0 for the last 8hrs =)
Probably could clock it higher, I tried 325mhz but it stops hashing after like 20mins... think the USB may not be up to par in supplyin enough power to it.

I have a fat old P4 chipset NB heatsink on the heatspreader, its definitely runnin hotter than before ...

I have:
Y1 25 MHz Oscillator (that’s the 25 in the frequency formula)
U1 CP2102 USB to UART Bridge
U2 BM1380 ASIC
U3 503B or 5038 (hard to read) WTF?
U4 AOZ1021A Voltage Regulator
U5 5B402? WTF?

IF it was a straight 5% HW loss, you'd be looking at 2.09GH/s. I doubt this is the case, so yeah, I'd say worth it. The life span of these (really any ASIC miner) is pretty short. Run 'em while you can!!

I quite don't remember seeing an answer for my following question, so excuse me if somehow I'm duplicating it but, what is the real impact in the hashrate of those hardware errors?
Does it mean that hashing at 2.2 with 5% HW is the same as hashing at 1.8 with 0%?
Basically, is it worth?

Hi all,

I have a Bitmain Antminer U1 USB miner (1.6 GH/s) which seems to be dead. When I start cgminer, it doesn't seem to find any USB device attached. Here's the output:


Does Bitmain have any kind of warranty, repair, or replacement?

I have another (separate) Antminer U1 and it seems to be working great.

Posted cgminer 4.0.1 with fixes for these.

Guys, I have a strange Problem. Hope someone is able to help me. 0.05BTC bounty for getting my miners to atleast 2,6 Ghash each

I got 16 Antminer U1. All are running at 1,088 V. I have a 49 Port USB Hub and a 450W PSU exclusively for those 16 U1. I have additional coolers attached and a fan blowing cool air. The Miners get definitely not too warm.

I tried Bitmain´s Cgminer, different BFGminer version on Windows, Minepeon and Raspcontrol. Cgminer gave me too much errors and for BFGminer I have the following Problem:

While I should be able to get 48 or atleast 44,8 Ghash out of the 16 U1, I get far less. Recently did some testing with BFGminer 3.10 and Raspcontrol

At 4D81 I get 6 Ghash
At 4C81  I get  10 Ghash
At 0B81  I get  12 Ghash
At 0A81  I get  15 Ghash
At 0981  I get  14 Ghash
At 0781  I get 10 Ghash

The Problem here is, that most Miners run somewhere under 500 Mhash. No Hardware Errors. Those U1 who do more Ghash are getting warmer then those who only do some Mhash. From test to test the variance is very big.

Currently they run with 4C81 under BFGminer 3.9.0 and Minepeon with 25Ghash. For some reason the hashrates with bfgminer 3.9.0 are similar among all sticks. The best result I got so far was about 30Ghash (also BFGminer 3.9.0 and Minepeon). The funny thing is, that I didn't give any frequenzy to BFGminer in this test so that the Miner should have run with 1,6Ghash. For some reasen they did nearly 2Ghash. This was absolut stable (ran for <24 hours). Again: I do not get any errors (or very very few on some sticks <.1) beyond 4E81.

Sorry for the bad english  

Thanks
Muto

Hi, Im running 14 Antminers, BFGminer, Linux. All run perfectly fine with < .10 HW errors. However I have two U1's that when plugged in just rack up the HW errors. Like a HW error every five seconds. I went one-by-one and found the problem ones, and they don't run now with the good ones. Im clocking the 14@ 2 gh/s. The two hubs that I have the U1's split between are both high quality and Im sure its not a hub power problem.

Is there anything I can do with these two error-prone U1's? Like, can I specify BFGminer to run AMU 14 & 15 at a clock speed lower than all of the others? Can I mount them to a larger heatsink and have the HW errors go away? Or are they just plain toasted and should go in the E-cycle bin?

Thanks