Reviving an old thread... I've just updated my 5770 to a 7950 3G Mac Edition from MacSales. Here's my system config:
2010 Mac Pro 5,1 6-Core 3.33 GHz
High Sierra 10.13.5
24GB RAM
Samsung 840 Pro SSD for operating system
Apple Cinema Display 1680 x 1050
Spectre X20WG-Nagall Display 1680 x 1050
I'm seeing some odd glitches:
* Pixels on start-up when the 2nd display activates.
* A strange sparkling pattern in the lower right corner of the 1st Display when powering down.
Video links:
7950 Screen Sparkle:
7950 On / Off Sequence
Notes:
* This happens only in Mac boot screen mode (Switch = 2), and not in Win mode (Switch = 1) on the 7950.
* This happens only in High Sierra 10.13.5 and not in El Capitan 10.11.6, regardless of Switch position.
It sure sounds like a software driver issue in High Sierra related to the boot screen, but I want to rule out a hardware issue that's simply showing up in High Sierra, in case a warranty card exchange is needed.
If you've experienced either or both of the above anomalies, can you please reply here? I'll watch this thread. All comments are welcome!
Regards,
Sky