OC Example: Overclocking some Zotac GTX970s for ZEC


  • Staff

    In this example we are simply guessing and doing some trial and error.

    With a few gputool commands and simple text editing, we will:

    • Decrease the temps from 80C to 65C.
    • Decrease power usage by 20W per eGPU.
    • Hashrate remains about the same, up to a 10 h/s increase overall.

    Note: These may not be the best guesses or settings but we have made improvements within a few moments with little effort thanks to PIMP and gputool.

    Stock clocks:

    Temp: GPU0: 79C GPU1: 79C
    GPU0: 249 Sol/s GPU1: 247 Sol/s
    Total speed: 496 Sol/s
    +-----+-------------+--------------+
    | GPU | Power usage |  Efficiency  |
    +-----+-------------+--------------+
    |  0  |    144W     |  1.73 Sol/W  |
    |  1  |    138W     |  1.79 Sol/W  |
    +-----+-------------+--------------+
    INFO 09:25:08: GPU1 Accepted share 85ms [A:5798, R:16]
    INFO 09:25:11: GPU1 Accepted share 86ms [A:5799, R:16]
    INFO 09:25:19: GPU1 Accepted share 86ms [A:5800, R:16]
    Temp: GPU0: 79C GPU1: 79C
    GPU0: 249 Sol/s GPU1: 244 Sol/s
    Total speed: 493 Sol/s
    +-----+-------------+--------------+
    | GPU | Power usage |  Efficiency  |
    +-----+-------------+--------------+
    |  0  |    144W     |  1.73 Sol/W  |
    |  1  |    137W     |  1.78 Sol/W  |
    +-----+-------------+--------------+
    INFO: Detected new work: 685801cd7e8b81b5cd4a
    Temp: GPU0: 79C GPU1: 79C
    GPU0: 254 Sol/s GPU1: 241 Sol/s
    Total speed: 495 Sol/s
    

    Changed powerlimit to 130 and fans to 90:

    gpu-config.json:

    {
      "comment": "Please see https://getpimp.org for information about configuring this file",
      "gpuSettings": [
        {
        "gpu_id": "0",
        "NVCOffset": "0",
        "NVMOffset": "0",
        "NVPLimit": "130",
        "fanspeed": "90",
        "temptarget": "70"
        },
        {
        "gpu_id": "1",
        "NVCOffset": "0",
        "NVMOffset": "0",
        "NVPLimit": "130",
        "fanspeed": "90",
        "temptarget": "70"
        }
      ]
    }
    
    Temp: GPU0: 64C GPU1: 67C
    GPU0: 254 Sol/s GPU1: 250 Sol/s
    Total speed: 504 Sol/s
    +-----+-------------+--------------+
    | GPU | Power usage |  Efficiency  |
    +-----+-------------+--------------+
    |  0  |    138W     |  1.84 Sol/W  |
    |  1  |    135W     |  1.85 Sol/W  |
    +-----+-------------+--------------+
    INFO 09:35:45: GPU1 Accepted share 132ms [A:5, R:0]
    Temp: GPU0: 64C GPU1: 67C
    GPU0: 248 Sol/s GPU1: 245 Sol/s
    Total speed: 493 Sol/s
    

    So we made a slight efficiency. Let's try bumping some clocks up. Zcash loves memclocks.

    Setting clocks to 60/300 to see what happens:

    gpu-config.json:

    {
      "comment": "Please see https://getpimp.org for information about configuring this file",
      "gpuSettings": [
        {
        "gpu_id": "0",
        "NVCOffset": "60",
        "NVMOffset": "300",
        "NVPLimit": "130",
        "fanspeed": "90",
        "temptarget": "70"
        },
        {
        "gpu_id": "1",
        "NVCOffset": "60",
        "NVMOffset": "300",
        "NVPLimit": "130",
        "fanspeed": "90",
        "temptarget": "70"
        }
      ]
    }
    

    Looks like we got another bump up:

    INFO 09:40:47: GPU1 Accepted share 146ms [A:1, R:0]
    Temp: GPU0: 58C GPU1: 60C
    GPU0: 256 Sol/s GPU1: 245 Sol/s
    Total speed: 501 Sol/s
    +-----+-------------+--------------+
    | GPU | Power usage |  Efficiency  |
    +-----+-------------+--------------+
    |  0  |    138W     |  1.86 Sol/W  |
    |  1  |    138W     |  1.78 Sol/W  |
    +-----+-------------+--------------+
    INFO 09:41:21: GPU0 Accepted share 85ms [A:1, R:0]
    INFO 09:41:26: GPU1 Accepted share 86ms [A:2, R:0]
    Temp: GPU0: 61C GPU1: 63C
    GPU0: 257 Sol/s GPU1: 246 Sol/s
    Total speed: 503 Sol/s
    +-----+-------------+--------------+
    | GPU | Power usage |  Efficiency  |
    +-----+-------------+--------------+
    |  0  |    138W     |  1.86 Sol/W  |
    |  1  |    137W     |  1.80 Sol/W  |
    +-----+-------------+--------------+
    INFO 09:41:46: GPU0 Accepted share 85ms [A:2, R:0]
    

    Bumping a little more to 70/500:

    gpu-config.json:

    {
      "comment": "Please see https://getpimp.org for information about configuring this file",
      "gpuSettings": [
        {
        "gpu_id": "0",
        "NVCOffset": "70",
        "NVMOffset": "500",
        "NVPLimit": "130",
        "fanspeed": "90",
        "temptarget": "70"
        },
        {
        "gpu_id": "1",
        "NVCOffset": "70",
        "NVMOffset": "500",
        "NVPLimit": "130",
        "fanspeed": "90",
        "temptarget": "70"
        }
      ]
    }
    

    Results:

    INFO 09:44:57: GPU0 Accepted share 88ms [A:2, R:0]
    Temp: GPU0: 61C GPU1: 64C
    GPU0: 250 Sol/s GPU1: 245 Sol/s
    Total speed: 495 Sol/s
    +-----+-------------+--------------+
    | GPU | Power usage |  Efficiency  |
    +-----+-------------+--------------+
    |  0  |    133W     |  1.88 Sol/W  |
    |  1  |    137W     |  1.79 Sol/W  |
    +-----+-------------+--------------+
    INFO: Detected new work: d9041c48a4eb0619cecf
    Temp: GPU0: 63C GPU1: 65C
    GPU0: 252 Sol/s GPU1: 245 Sol/s
    Total speed: 497 Sol/s
    +-----+-------------+--------------+
    | GPU | Power usage |  Efficiency  |
    +-----+-------------+--------------+
    |  0  |    139W     |  1.81 Sol/W  |
    |  1  |    141W     |  1.74 Sol/W  |
    +-----+-------------+--------------+
    INFO 09:45:49: GPU0 Accepted share 89ms [A:3, R:0]
    
    
    
    ## Bumping clocks up to 80/600:
    
    gpu-config.json:
    ```json
    {
      "comment": "Please see https://getpimp.org for information about configuring this file",
      "gpuSettings": [
        {
        "gpu_id": "0",
        "NVCOffset": "80",
        "NVMOffset": "600",
        "NVPLimit": "130",
        "fanspeed": "90",
        "temptarget": "70"
        },
        {
        "gpu_id": "1",
        "NVCOffset": "80",
        "NVMOffset": "600",
        "NVPLimit": "130",
        "fanspeed": "90",
        "temptarget": "70"
        }
      ]
    }
    

    Results:

    [/root]:# gputool --status
    PIMP GPU Tool v20171021 GPUs type: NVidia
    GPU 0: (GeForce GTX 970), Temp: 53C, Fan: 90%, Core Clock: 202 Mhz ( Offset), Memory Clock: 324 Mhz ( Offset), Performance state: 8, Power Usage: 22.4W (130W Max)
    GPU 1: (GeForce GTX 970), Temp: 54C, Fan: 90%, Core Clock: 696 Mhz ( Offset), Memory Clock: 810 Mhz ( Offset), Performance state: 5, Power Usage: 21.9W (130W Max)
    [Agent: LilJimmy01 (Running) Total HR: [0.00Kh/s] Miners running [0] GPUs [none active]]
    [09:46 AM][Uptime: 4d 16:33][root@pimp2(10.0.0.195)]
    [/root]:# gputool --config
    PIMP GPU Tool v20171021 GPUs type: NVidia
    Configuring 2 GPUs..
    Set Fan speed to 90% on GPU 0
    PowerLimit was set to 130 W for GPU 0
    Core speed was offset 80 for GPU 0
    Memory speed was offset 600 for GPU 0
    Set Fan speed to 90% on GPU 1
    PowerLimit was set to 130 W for GPU 1
    Core speed was offset 80 for GPU 1
    Memory speed was offset 600 for GPU 1
    
    Temp: GPU0: 64C GPU1: 67C
    GPU0: 251 Sol/s GPU1: 245 Sol/s
    Total speed: 496 Sol/s
    +-----+-------------+--------------+
    | GPU | Power usage |  Efficiency  |
    +-----+-------------+--------------+
    |  0  |    137W     |  1.83 Sol/W  |
    |  1  |    137W     |  1.79 Sol/W  |
    +-----+-------------+--------------+
    Temp: GPU0: 65C GPU1: 67C
    GPU0: 251 Sol/s GPU1: 242 Sol/s
    Total speed: 493 Sol/s
    +-----+-------------+--------------+
    | GPU | Power usage |  Efficiency  |
    +-----+-------------+--------------+
    |  0  |    139W     |  1.81 Sol/W  |
    |  1  |    136W     |  1.78 Sol/W  |
    +-----+-------------+--------------+
    

    Conclusion:

    • Decreased the temps from 80C to 65C.
    • Decreased power usage by 20W per eGPU.
    • Hashrate remains about the same, up to a 10 h/s increase overall.

    From:

    Temp: GPU0: 79C GPU1: 79C
    Total speed: 496 Sol/s
    | 0 | 144W | 1.73 Sol/W |
    | 1 | 138W | 1.79 Sol/W |

    To:

    Temp: GPU0: 65C GPU1: 67C
    Total speed: 493 Sol/s
    | 0 | 139W | 1.81 Sol/W |
    | 1 | 136W | 1.78 Sol/W |


 



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