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I'm having exactly the same issue on 10.14.6. "Unlocking with Apple Watch" appears for a split second then disappears. I've tried everything I can think of, everything suggested on this thread. It was working before the 10.14 upgrade.

Thanks! All seems fine and dandy with the connections now. I guess it was just a coincidence but I'm not going to mess with it anymore. I think I'll give the flashing a try once I have a reliable backup card. They pop up every so often under 50 bucks. The 1,1 lives to fight another day.

So I took it out, tested all the pins on cables and the card with a continuity meter. They all checked out. Reinstalled the card and it works! I'm suspecting either a bad connection somewhere or a some kind of overload capacitor that discharged overnight the first time and discharged today...

Still unresponsive today. I can't figure out why it started working again the last time. Any ideas?

So I have this Club 3d HD7950 that I'm trying to get going in my old Mac Pro, and this particular card has 1x6pin and 1x 8pin power connectors. So I need an 6 to 8pin adapter. The adapter I found locally has pin #8 empty, which according to the standard GPU pinout, should be a ground...

I think there's something not quite right with this 7950. After getting bad benchmark numbers I removed it yesterday to run more comparisons with the 5770. Then I put it back in again and it was totally dead. I could get to the login screen via VNC and checked the hardware report. Nothing...

Ok that makes sense. How should that translate to the real world in FCPX and photo editing apps like Capture One that uses OpenCL? They should speed up using multiple cores, right?

So I took a chance because no alternative came up, and the card seems to function just fine, no problems on boot. I am, however, not overwhelmed by the improvement over the 5770 I had previously installed. I ran a few benchmarks and wasn't impressed. Geek bench scores actually went down...

I'm looking at a Club 3D HD7950 for my Mac Pro1,1 already running Yosemite. I'm not too worried about a boot screen and I never sleep my computer (either on or off), so I won't try to flash it just yet. But I do notice it has 2xDVI rather than 1xDVI on the reference model. Should I expect any...