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PCIe x16 support

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Dec 24, 2015
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Motherboard
ASrock X99 Extreme4
CPU
i7-5820K
Graphics
GTX 960, R9 280X & RX 580
Mac
  1. iMac
  2. MacBook
  3. MacBook Pro
Classic Mac
  1. Apple
  2. Power Mac
Mobile Phone
  1. iOS
My motherboard has 2 PCIe x16 slots and the rest are x8. I was running under the iMac 14,1 system definitions and now I am running under Mac Pro 6,1, but either way, it still only has one of my slots displayed as x16 and the other as x8.

I apologize if this is the wrong forum for this question, but does anyone know how (or if possible) to get macOS Sierra to run the other slot at x16? It's probably choking the video card in that slot.
 

slim.jim

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Joined
Dec 17, 2014
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Motherboard
MSI Z97 Gaming 9 AC
CPU
i7-4790K
Graphics
RX 5700 XT
Mac
  1. MacBook Pro
Classic Mac
  1. PowerBook
Mobile Phone
  1. iOS
My motherboard has 2 PCIe x16 slots and the rest are x8. I was running under the iMac 14,1 system definitions and now I am running under Mac Pro 6,1, but either way, it still only has one of my slots displayed as x16 and the other as x8.

I apologize if this is the wrong forum for this question, but does anyone know how (or if possible) to get macOS Sierra to run the other slot at x16? It's probably choking the video card in that slot.

Your processor only has 28 PCIe lanes so you won't get two x16 slots.

28 lanes = x16, x8, x4

40 lanes = x16, x16, x8
 
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