My two cards are detected by catalyst and guiminer, but wont both work at once.
I have 5850 and 5750 cards. Extend desktop is selected and a dummy plug is in the 5750. Catalyst reports the 5850 as being the connected monitor, and the 5750 as being " Default VGA monitor [ Single ]". Guiminer sees the 5850 as 0-0 Cypress, and 5750 as 0-1 Juniper. These work fine mining and at their expected speeds if only one is used.
However, if I try running both at once, to different pools, whichever card started first begins to choke and falls to almost no speed at all. These are run in xp sp3. I have clean installed the newest catalyst multiple times, tried with and without the dummy plug, have plenty of juice on the psu, and have set them to different core affinity. So far nothing gets them both working at once.
Can anyone make sense of this for me, or better yet, offer a solution to using them together at the same time ?