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Title: Enabling a second gfx? Post by: pindis on May 22, 2011, 01:50:10 PM Hi guys I have a 6850 and a 5770.
Atm the 5770 runs in the 16x pci port while the 6850 runs in 4x. I have reinstalled drivers to 11.5 and sdk to 2.4. But I'm yet to see my 6850 pop up in guiminer :( When i go to catalyst I and watch under information, it says it's there, but disabled. I tried searching a bit, and didn't find anything. So I hope there's a gentle soul here that would help me our, will even donate 0.5 btc :) Title: Re: Enabling a second gfx? Post by: Sonata on May 22, 2011, 02:04:24 PM You need to trick Windows into thinking that you have a monitor plugged into your other card. Windows requires at least one display to be plugged into a card before it turns on/activates itself. You can solve this by plugging in a monitor, starting GUIMiner and start mining, then unplugging the monitor, or just create a dummy VGA plug, which does the same thing, except you don't have to keep unplugging monitors. (http://soerennielsen.dk/mod/VGAdummy/index_en.php)
Title: Re: Enabling a second gfx? Post by: pindis on May 22, 2011, 02:16:20 PM You need to trick Windows into thinking that you have a monitor plugged into your other card. Windows requires at least one display to be plugged into a card before it turns on/activates itself. You can solve this by plugging in a monitor, starting GUIMiner and start mining, then unplugging the monitor, or just create a dummy VGA plug, which does the same thing, except you don't have to keep unplugging monitors. (http://soerennielsen.dk/mod/VGAdummy/index_en.php) Thanks alot buddy! :) EDIT: donation coming in your way! Title: Re: Enabling a second gfx? Post by: Sonata on May 22, 2011, 02:43:30 PM No problem, and thanks for the first donation!
Title: Re: Enabling a second gfx? Post by: bobR on May 22, 2011, 02:52:13 PM See this thread if you just want to buy a vga dummy plug
http://forum.bitcoin.org/index.php?topic=8325.0 (http://forum.bitcoin.org/index.php?topic=8325.0) Title: Re: Enabling a second gfx? Post by: landshark on May 22, 2011, 03:42:52 PM One other thing you might want to know...
When you go to buy the resistors, you will notice that you have a choice of several different wattage ratings. 1/8w, 1/4, 1/2 and so on. I built mine successfully using 75ohm, 1/4w, 2% tolerance resistors. So, I know these work with my second 6870 card. If you can't find these exactly, you might try a different ohm rating such as 68ohm or 100ohm...1/4 or 1/2w rated. I have read that other people have had success with these combinations. Tolerance does not seem to be a big factor in choosing a resistor for this purpose... but personally, I wouldn't go higher than 5% just to be safe. Good luck and happy mining! Title: Re: Enabling a second gfx? Post by: pindis on May 22, 2011, 03:44:32 PM One other thing you might want to know... When you go to buy the resistors, you will notice that you have a choice of several different wattage ratings. 1/8w, 1/4, 1/2 and so on. I built mine successfully using 75ohm, 1/4w, 2% tolerance resistors. So, I know these work with my second 6870 card. If you can't find these exactly, you might try a different ohm rating such as 68ohm or 100ohm...1/4 or 1/2w rated. I have read that other people have had success with these combinations. Tolerance does not seem to be a big factor in choosing a resistor for this purpose... but personally, I wouldn't go higher than 5% just to be safe. Good luck and happy mining! Thanks for the input, but I don't mind just attaching my HDMI in my screen and deplug it once its started :o) Title: Re: Enabling a second gfx? Post by: Adeq on May 22, 2011, 06:27:55 PM The 5-second VGA Dummy Plug (by zorinaq)
http://blog.zorinaq.com/?e=11 |