Subpar hashrate on my rig?

Axel6430Axel6430 Member Posts: 2
Hello everyone,
I'm new to Ethereum mining, I bought a friend's mining rig and built a case for it. All the software is already installed, it runs on Ubuntu 14.04.
Its hardware specs are:
MB: H61 Pro BTC
PSU: Leta G1600
- 1 HD7970
- 1 R280X
CPU: Intel(R) Celeron(R) CPU G540 @ 2.50GHz
Seems to mine fine, for the most part, except it seems to me like the hashrate is really low. With these two GPUs I get about 32MH/s.
I tried to do some troubleshooting, update the drivers. When testing with a single GPU I get 16MH/s out of either card, kind of far from the 24-25MH/s I see on benchmarks.
For a moment I thought this was due to the GPUs having been used for a year straight prior to that, but recently I bought an additional HD7970 from someone who used it for gaming (and gave it proper maintenance), still gives me 16MH/s. The three GPUs put together output 46MH/s.
Is there something I'm missing there? Is that a normal hashrate for a rig like this or is there an issue?


  • weenstonweenston Member Posts: 11
    What drivers are you using? How are your temps? Which miner are you using?
  • Axel6430Axel6430 Member Posts: 2
    edited August 2016
    Thanks for the help!
    Doing a driver check on the terminal returns "fglrx 15.20.3"

    Trying to read GPU temps but it doesn't let me install lm-sensors for some reason...
    [email protected]:~# apt-get install lm-sensors
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    You might want to run 'apt-get -f install' to correct these:
    The following packages have unmet dependencies:
     solc : Depends: libethereum (= 1.2.2~trusty-0ubuntu1) but 1.2.9-SNAPSHOT--20160628-6a05dd7~trusty-0ubuntu1 is to be installed
    E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
    [email protected]:~# apt-get -f install
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    Correcting dependencies... Done
    The following packages were automatically installed and are no longer required:
      checkbox-ng checkbox-ng-service libandroid-properties1 libhud2
      liboxideqtcore0 libqt5positioning5 libqt5webkit5-qmlwebkitplugin
      libthumbnailer0 libufe-xidgetter0 libunity-action-qt1 libv8-3.14.5 libv8-dev
      oxideqt-codecs plainbox-provider-checkbox plainbox-provider-resource-generic
      plainbox-secure-policy python3-checkbox-ng python3-checkbox-support
      python3-plainbox python3-pyparsing python3-requests python3-urllib3
      qml-module-qtquick-localstorage qml-module-qtwebkit
      qtdeclarative5-accounts-plugin qtdeclarative5-dialogs-plugin
      qtdeclarative5-localstorage-plugin qtdeclarative5-privatewidgets-plugin
      qtdeclarative5-unity-action-plugin qtdeclarative5-window-plugin
    Use 'apt-get autoremove' to remove them.
    The following extra packages will be installed:
    The following packages will be upgraded:
    1 upgraded, 0 newly installed, 0 to remove and 210 not upgraded.
    11 not fully installed or removed.
    Need to get 0 B/2 044 kB of archives.
    After this operation, 14,9 MB of additional disk space will be used.
    Do you want to continue? [Y/n] Y
    (Reading database ... 174159 files and directories currently installed.)
    Preparing to unpack .../solc_1%3a0.3.6-0ubuntu1~trusty_amd64.deb ...
    Unpacking solc:amd64 (1:0.3.6-0ubuntu1~trusty) over (1.2.2~trusty-0ubuntu1) ...
    Replacing files in old package lllc:amd64 (1.2.9-SNAPSHOT--20160628-6a05dd7~trusty-0ubuntu1) ...
    dpkg: error processing archive /var/cache/apt/archives/solc_1%3a0.3.6-0ubuntu1~trusty_amd64.deb (--unpack):
     trying to overwrite '/usr/lib/', which is also in package libethereum:amd64 1.2.9-SNAPSHOT--20160628-6a05dd7~trusty-0ubuntu1
    dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
    Errors were encountered while processing:
    E: Sub-process /usr/bin/dpkg returned an error code (1)
    [email protected]:~# sensors detect
    The program 'sensors' is currently not installed. You can install it by typing:
    apt-get install lm-sensors
    The mining software is ethminer.
  • zawawazawawa Member Posts: 27
    16-17 MH/s is pretty normal for a combination of 7970/280X at stock clock and ethminer. You definitely need to crank up memory clock and undervolt/underclock the core. Claymore's miner should also give you a 5% boost. Hope this helps.
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