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calmasacow

macrumors member
Original poster
Jun 13, 2012
53
8
Houston, TX
Ok So I have a "DELL RX580 8GB Reference" card and solar in Mojave it is performing well in my 12 core MacPro 5,1. "is not a 4,1>5,1"


UPDATE:I loaded the card into a windows machine as I was thinking of flashing the Bios to take the max power down from 160WATTs to 150 WATTS so it would be in the safe zone of a single 6 pin connector. Well When I loaded up the the bios editor Low and behind what did I see?
Screenshot 2018-10-07 23.27.41 copy.png

so no only are the rumors of this card being power limited in the BIOS to fit in a reduced power envelope true. It appears that the Envelope is FAR LOWER than I had expected and is WELL UNDER the 150 Watt limit of the single 6 pin connector!!! According to this it is 110 Watts!!!!!

So I'm going to I guess run a bench mark or 2 and see what it produces. I will come back and post results.


UPDATE 2: here are the stats but I will started a more in depth thread about this card HERE

I changed the list of remaining questions below now that the power issue is moot.


Remaining Questions:

  1. This shows as a RX580 in windows and a RX480 in OS X. I have read some things that state that this is normal and lays the blame at the 2 cards actually having the same Deveice ID. If so though then how are other users with other RX580 cards having theirs show up as a RX580 in OSX
  2. is there some simple way to get HDMI audio working? I aways get points to these threads that have a tone of info for like a ton of processes for tone of different cards. does anyone know walkthrough specific for the RX580 cards? I have seen that there is a way to Mod the Bios for these cards. is there a way I can make this cards appear as a "Mac Edition" card. Also do "Mac Edition" cards have working HDMI audio?
This is the exact card here
https://www.ebay.co.uk/itm/123018942147

https://www.ebay.com/itm/183100900082



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You missed an important factor regarding the TDP and the wiring. First off all the Macs PSU is such sturdy build that it can easily surpass the connectors advertised power. This is especially the case for GPUs, as they almost never draw all the power they theoretically could. Besides that the Mac Pro could easily power two of those, while being within it's specs, because you missed the fact that au to 75Watts are drawn from the PCIe port itself, and not the 6-pin connector. That's why 6-pins are 75Watt rated while 8Pins are build for 150Watt power consumption. So your custom cable is totally irrelevant. In fact with this setup the power-draw on each of the Macs mini-PCI ports is somewhere between 17,5W [(110W TDP - 75W PCIe):2 mini-6-pin] and 27,5W [(110W : 2 {half, each source}):2 mini-6-pin].

You should be able to check using HWMonitor, which can be found here (you don't need the included drivers).
 
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