mandrix Posted February 21, 2013 Share Posted February 21, 2013 I have two Power Color 7950's in crossfire. Monitoring is done via Aida64 through Aquasuite. Upon first installing Aida64 updates both gpu diodes normally show up, yet after a time the second gpu disappears from the Preferences / External applications section, and thus does not get written to WMI. Sometimes I can fiddle with gpu-z or other apps and get the gpu 2 diode to show up, lately not so much. Any fix for this? Quote Link to comment Share on other sites More sharing options...
Fiery Posted February 21, 2013 Share Posted February 21, 2013 I think the issue may be CrossFire. In CrossFire mode AMD GPUs tend to use a power-saving trick called ULPS. When ULPS is active, it's absolutely not safe to detect any GPU properties for the non-primary GPU(s). Measuring temperatures when ULPS is active could cause a BSoD or system lockup This is a ULPS implementation limitation that cannot be fixed from software. Regards, Fiery Quote Link to comment Share on other sites More sharing options...
mandrix Posted February 22, 2013 Author Share Posted February 22, 2013 Ah, OK. Thanks for your response. I believe I disabled ULPS a while back but not sure if it was on this machine or my other Crossfire rig. Been a while since I delved into it. I guess I will be fine with just gpu 1, it's just that the second card normally runs hotter in my setup but only by 2C. Quote Link to comment Share on other sites More sharing options...
Fiery Posted February 22, 2013 Share Posted February 22, 2013 ULPS needs to be disabled everytime you change (e.g. upgrade) the video driver (Catalyst). Quote Link to comment Share on other sites More sharing options...
mandrix Posted February 23, 2013 Author Share Posted February 23, 2013 That would explain it. Thanks! Quote Link to comment Share on other sites More sharing options...
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