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Title: Antminer U3 peaks at 370Mh/s Post by: Xerber on February 09, 2016, 06:48:57 PM Hi guys,
Last Sunday I bought a used Antminer U3. It looked brand new (none of the usual dust deposit on the fan blades or the unit), so I thought I had a pretty good deal. However, unfortunately its hash rate peaks at about 370Mh/s, far lower than the claimed 63Gh/s. It starts out at 1.3Gh/s and then immediately drops only to end at, and remain at, 370Mh/s. I tried several power supplies (it is currently powered using a 120W 12V power supply) and both CGminer and bfgminer (with and without OC settings). Also, after further inspection of the unit last night, I noticed that two of the heatsink's screws were damaged as if a wrong size Philips screwdriver was used on them. Fearing that the PCB or chips might be damaged due to overtightening, I disassembled the unit, checked the PCB for damage and applied new thermal paste. Visually, nothing seemed to be out of the ordinary (i.e. no cracks). Do you guys think I made an error somewhere or did I simply purchase a lemon? Thanks in advance for your help and input. :) Title: Re: Antminer U3 peaks at 370Mh/s Post by: notlist3d on February 10, 2016, 01:42:37 AM Hi guys, Last Sunday I bought a used Antminer U3. It looked brand new (none of the usual dust deposit on the fan blades or the unit), so I thought I had a pretty good deal. However, unfortunately its hash rate peaks at about 370Mh/s, far lower than the claimed 63Gh/s. It starts out at 1.3Gh/s and then immediately drops only to end at, and remain at, 370Mh/s. I tried several power supplies (it is currently powered using a 120W 12V power supply) and both CGminer and bfgminer (with and without OC settings). Also, after further inspection of the unit last night, I noticed that two of the heatsink's screws were damaged as if a wrong size Philips screwdriver was used on them. Fearing that the PCB or chips might be damaged due to overtightening, I disassembled the unit, checked the PCB for damage and applied new thermal paste. Visually, nothing seemed to be out of the ordinary (i.e. no cracks). Do you guys think I made an error somewhere or did I simply purchase a lemon? Thanks in advance for your help and input. :) What commands are you using when running it? Also when you say your trying different power supplies did it not come with one? The U3 should come with a power brick, not the adapter cable to wall. But it comes with power brick. Title: Re: Antminer U3 peaks at 370Mh/s Post by: leowonderful on February 10, 2016, 12:45:00 PM Hi guys, Cheap power brick is probably the problemLast Sunday I bought a used Antminer U3. It looked brand new (none of the usual dust deposit on the fan blades or the unit), so I thought I had a pretty good deal. However, unfortunately its hash rate peaks at about 370Mh/s, far lower than the claimed 63Gh/s. It starts out at 1.3Gh/s and then immediately drops only to end at, and remain at, 370Mh/s. I tried several power supplies (it is currently powered using a 120W 12V power supply) and both CGminer and bfgminer (with and without OC settings). Also, after further inspection of the unit last night, I noticed that two of the heatsink's screws were damaged as if a wrong size Philips screwdriver was used on them. Fearing that the PCB or chips might be damaged due to overtightening, I disassembled the unit, checked the PCB for damage and applied new thermal paste. Visually, nothing seemed to be out of the ordinary (i.e. no cracks). Do you guys think I made an error somewhere or did I simply purchase a lemon? Thanks in advance for your help and input. :) Title: Re: Antminer U3 peaks at 370Mh/s Post by: Xerber on February 18, 2016, 05:18:02 PM Hi guys,
My apologies for the late reply. Some IRL familiy stuff happened. I see now that I forgot to mention that I was running cgminer and bfgminer on Windows 10. The unit did not come with a PSU. Perhaps the previous owner kept it. At first I attempted several PC PSU's that I had lying around (CoolerMaster, Corsair, Antec varying between 400W and 850W), but had no luck with those. Ultimately, I lend the U3 to a friend for a couple of days and he had no trouble getting it to run on Debian. He returned the unit last weekend and I had some time today to tinker with it some more. I bought a Pi2 and a 120W PSU, just now installed Raspbian and I got running within 20 minutes using cgminer. I'm happy that it runs, but I still have no clue where I went wrong with the Windows versions of cgminer and bfgminer. I did use Zadig to replace the driver, but perhaps it was still a driver issue? Thanks again. Title: Re: Antminer U3 peaks at 370Mh/s Post by: yudismart on February 19, 2016, 11:51:30 PM thx for this info, i like this, couse i need.
Title: Re: Antminer U3 peaks at 370Mh/s Post by: notlist3d on February 20, 2016, 09:31:00 AM Hi guys, My apologies for the late reply. Some IRL familiy stuff happened. I see now that I forgot to mention that I was running cgminer and bfgminer on Windows 10. The unit did not come with a PSU. Perhaps the previous owner kept it. At first I attempted several PC PSU's that I had lying around (CoolerMaster, Corsair, Antec varying between 400W and 850W), but had no luck with those. Ultimately, I lend the U3 to a friend for a couple of days and he had no trouble getting it to run on Debian. He returned the unit last weekend and I had some time today to tinker with it some more. I bought a Pi2 and a 120W PSU, just now installed Raspbian and I got running within 20 minutes using cgminer. I'm happy that it runs, but I still have no clue where I went wrong with the Windows versions of cgminer and bfgminer. I did use Zadig to replace the driver, but perhaps it was still a driver issue? Thanks again. It's hard to say some they load zadig once... and no issues works great. Others it's one of the most painful driver installs they will have. I think you will be much happier with the RPI then you were on windows. It is also a low power controller which is great. I think long term you made a good decision. As you can always use the RPI for tons of projects one day after done mining with it. |