I have only one 6990 card on board, but when I use aticonfig --list-adapters, I got:
* 0. 08:00.0 AMD Radeon HD 6990
1. 07:00.0 AMD Radeon HD 6990
and I run the miner:
./poclbm -u ** --pass ** -o ***... -d 0
this miner give me about 330 mH/s rate
but when I try to launch another miner, using device 1, I got error:
pyopencl.LogicError: clGetPlatformIDs failed: invalid/unknown error code
any suggestions? thanks.
You got the wrong syntax for sure. For example, this is what deepbit uses. (I would double check the device syntax, could be --Device or -Device.)
poclbm.exe -d1 --host=pit.deepbit.net --port=8332 --user=example@example.com --pass=password -DEVICE 0
poclbm.exe -d1 --host=pit.deepbit.net --port=8332 --user=example@example.com --pass=password -DEVICE 1