Diff 1 Diff 4 Whats The Difference

Discussion in 'Proof-of-work Mining' started by DonnyM, Feb 17, 2016.

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  1. DonnyM

    DonnyM New Member

    Jan 1, 2016
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    Pool Mining on dcr.MaxMiners.Net
    Have two cards in one PC. Each GPU are running there own CGMiner.
    One card is a: AMD FirePro W5000 (FireGL V) 825Mhz core and 800Mhz memory
    The second is a: ATI FirePro V4800 (FireGL) 775Mhz Core and 900Mhz memory
    The W5000 has around 140M while the V4800 runs at 400M
    I am getting 98.9% efficiency according to the site.
    Why does the faster card run slower?
    On the dcr.MaxMiners site they have two Ports. One Diff 1 and one at Diff 4. What does this mean and why would you use one over the other.
    I get around 1 DCR per day. Is this normal or should I be getting a bit more.

    Donny
     
  2. Enjei

    Enjei New Member

    Feb 8, 2016
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    Are you using the W5000 to power the display at the same time it is mining?
    I would suggest using seperate cgminer instances for each card by using the --device flag on the command line.

    1 DCR/24 hours sounds about right for the hashrate you've given.
     
  3. DonnyM

    DonnyM New Member

    Jan 1, 2016
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    The w5000 powers 2 displays and the v4800 powers 2 displays. Yes the computer has 4 displays.
    I do have two different instances of cgminer running. Each one on its own gpu.
    In cgminer it shows 300m average for the w5000 but the pool always shows between 75 and 100 for the w5000.
    The v4800 shows average 400m in cgminer and runs around 500 to 600 on the pool. The numbers for the v4800 stay around the same whether the w5000 is running or not.

    On top of the above issue I still am wondering about the difficulty port on the pool and why I should choose one over the other.

    Intensity is set to 10 on both.
    Each cgminer is using about 14% CPU
     
  4. Enjei

    Enjei New Member

    Feb 8, 2016
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    Can you post a screenshot of your cgminer windows?

    The difficulty port is basically a way for the pool to reduce network communication load (if you have a large amount of hashing power, use a higher difficulty port so that you're not submitting low value shares constantly).
     
  5. DonnyM

    DonnyM New Member

    Jan 1, 2016
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    Attached is a screen shot of the two cgminers running.

    How do you determine what diff value to use? I am used to 1.2th per unit not this mh stuff so I am not sure about diff values in the dcr land.
     

    Attached Files:

  6. Enjei

    Enjei New Member

    Feb 8, 2016
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    #6 Enjei, Feb 17, 2016
    Last edited: Feb 17, 2016
    I don't see anything wrong with your setup, it would seem the W5000 should be performing better. I can only guess it's a driver issue.

    At the hashrate you have, I wouldn't worry about difficulty (the pool pays out proportionally, i.e. a diff 4 share is worth 4x as much but on average it takes 4x longer to find).
     
    DonnyM likes this.
  7. DonnyM

    DonnyM New Member

    Jan 1, 2016
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    15
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    Engineer
    Thanks for taking the time to help be get a better understanding of how it works. I use cgminer with a usb btc miner and I have a few S5's but never done gpu other than the curecoin thing.
     

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