How to get GTX 1070 to use PCIe 2.0 in Mac Pro

matthewpomar

macrumors member
Original poster
Oct 27, 2010
65
3
According to MacVidCards.com, one must use a modified ROM on a stock PC video card to get it to use the PCIe 2.0 spec vs the PCIe 1.0 spec when installed on a Mac Pro.

This MacRumors post suggests that it is not necessary to use a "flashed" ROM on an NVIDIA 1070 card if using the web drivers as it will work in PCIe 2.0 mode without being flashed, but Windows will only work in PCIe 1.0.

However, after purchasing a GTX 1070 Founder Edition and installing the Web Drivers, I'm see the the GPU only has a 2.5 GT/s link speed.

Does anyone know how to get the GPU to use PCIe 2.0 mode instead of PCIe 1.0? Is the only option to pay for a GPU flashing service?
 

tsialex

macrumors 604
Jun 13, 2016
7,624
8,351
Brazil
According to MacVidCards.com, one must use a modified ROM on a stock PC video card to get it to use the PCIe 2.0 spec vs the PCIe 1.0 spec when installed on a Mac Pro.

This MacRumors post suggests that it is not necessary to use a "flashed" ROM on an NVIDIA 1070 card if using the web drivers as it will work in PCIe 2.0 mode without being flashed, but Windows will only work in PCIe 1.0.

However, after purchasing a GTX 1070 Founder Edition and installing the Web Drivers, I'm see the the GPU only has a 2.5 GT/s link speed.

Does anyone know how to get the GPU to use PCIe 2.0 mode instead of PCIe 1.0? Is the only option to pay for a GPU flashing service?
What's your Mac Pro BootROM? You need 138.0.0.0.0 to enable 5GT/s.
 
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h9826790

macrumors G5
Apr 3, 2014
14,125
6,744
Hong Kong
According to MacVidCards.com, one must use a modified ROM on a stock PC video card to get it to use the PCIe 2.0 spec vs the PCIe 1.0 spec when installed on a Mac Pro.

This MacRumors post suggests that it is not necessary to use a "flashed" ROM on an NVIDIA 1070 card if using the web drivers as it will work in PCIe 2.0 mode without being flashed, but Windows will only work in PCIe 1.0.

However, after purchasing a GTX 1070 Founder Edition and installing the Web Drivers, I'm see the the GPU only has a 2.5 GT/s link speed.

Does anyone know how to get the GPU to use PCIe 2.0 mode instead of PCIe 1.0? Is the only option to pay for a GPU flashing service?
The link speed is dynamically adjusted for power saving. You may have to run CL!ng or CUDA-Z etc to confirm the actual link speed (depends on cMP firmware).

That 2.5GT/s in system info is not necessary your card's max link speed. It's been like that for many years.
 

thornslack

macrumors 6502
Nov 16, 2013
410
164
What's your Mac Pro BootROM? You need 138.0.0.0.0 to enable 5GT/s.
It was always my understanding that the web driver enabled pcie 2.0 in OS X. I'm still on 10.12.6 running boot rom MP51.007F.B03. I guess I need to do some testing. And update my rom blah :p
 
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