The red led's are off while I'm shutdown now. Don't use metal twizzers unless the other end of the cable is for sure disconnected from any display. It took about 3 attempts for each cable to get the tiny strip of tape to stay in the right place. And then carefully inserting the connector into the graphics card port. By covering pin 20 at one end of the cable, with a long 2mm wide sliver of black electrical tape. I learned from some photos with instructions, how to make a crude tempoary work around to make the cables work. In the mean time while I'm waiting for the Accell displayport cables. There seams to be very few cables like this on the market I think. I now have on order some "Accell UltraAV B142C-007B-2 DisplayPort to DisplayPort 1.2 Cable with Locking Latches (6.6ft /2m)" displayport cables from amazon.ca that I read is a 19 conductor cable, with no wire for pin 20, for this very problem. Which was going into the 470 causing the two red lights to light up. My Dell displays were sending 3.3 volts back out through the displayport cables on pin 20. The problem is known as "the displayport pin 20 problem". And turned out to be just the "AddOn" brand displayport cables I bought for the card. But while the two red led's were on (while the mac pro was off), I discovered I could also get them to turn off if I disconnected the displayport cables from the 470. The two red led's would go off once I boot up again. And the two red led's would even stay on if I pull the ac power cord out of the mac pro. I did have a problem with a proccessor board red led (the cpu one not the memory), and a red led on the 470, both lighting up, whenever I shut down the mac pro. I'm getting very close to the same Unigine Heaven Benchmark results the orginal poster has. I bought an "XFX Radeon RX470 RS 4GB GDDR5 True OC 1226MHZ XXX Edition w/ Backplate HDMI/DVI/3XDP Graphic Card" from " (Canada)" and installed it in my 3.33 6 core firmware upgraded 4,1.
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