Cgminer opens up, stays for like a second or two and then Windows gives me an error message. Mining (bitcoins?) without --scrypt works fine but with the scrypt parameter, I get the message seen in the window below.

cgminer with scrypt

The settings for the .bat file are also in the image and I think they've been configured correctly. I tried uninstalling, installing different drivers. Read somewhere that the new ones don't work (tried with the latest drivers already) so I installed Catalyst 12.2 Beta (GPU is a Radeon HD 6670, Driver Version: according to device manager) and it still doesn't work.

Help? :(

  • 1
    I have ran into the issue that after mining bitcoins my card will not mine scrypt without a full reboot of the system. Not sure what causes this but try it out and see if it helps.
    – Mark S.
    Dec 25, 2013 at 3:05
  • Tried that, still doesn't work.
    – SS'
    Dec 26, 2013 at 19:01
  • 1
    Checkout litecoin.info/Mining_hardware_comparison and see what settings are working for other folks particularly the settings that tbenz9 mentions (intensity and thread concurrency) also included with cgminer is a SCRYPT readme that will tell you the steps to follow to tweak these settings.
    – Mark S.
    Dec 26, 2013 at 19:06
  • Shaders! Including the appropriate shaders value for your GPU does wonders! And yes, sometimes, after passing the miner a set of params that crash it, the GPU gets "stuck" in a bad state - you need to cold-reboot. So yes, reduce intensity and threads, set an appropriate shaders value, and cold-reboot just in case.
    – Joe Pineda
    Dec 26, 2013 at 20:45

1 Answer 1


I've seen this problem a few times, it could be just about anything unfortunately. I would try changing your thread concurrency, and intensity values. Some people have also recommended different drivers.

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