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Multiple GPU's - One For Windows One For OSX?

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cheyne

cheyne

Joined
Nov 23, 2015
Messages
17
Motherboard
Gigabyte Z97MX-Gaming 5
CPU
Core i7 4790K 4Ghz
Graphics
EVGA GeForce GTX 1080 SC
Hey guys

Quick question, I dual boot with Windows which I used for gaming, but my work happens on the OSX portion of my machine. I'm about to pick up a Geforce GTX 1080 which I know is not supported in OSX right now. My onboard iGPU does not support 4K either (I have a 4k monitor).

So to my question, do you think it's possible (or reasonable) to pick up a cheap GTX 950 or something of the like, and install it on of the spare PCI-X 4x slots and only use this for OSX, yet leave my 1080 in the PCI-X 16x for Windows?

Will I have any problems do you think?

It's not ideal, but if Its going to cost me $90 to get my OSX machine back, then its worth it.
 
There are people using integrated Intel graphics, AMD and other nVidia cards this way and discussing their experiences on the following thread:
http://www.tonymacx86.com/threads/nvidia-geforce-gtx-1080-1070.192399/

It has not been successful for everyone - but most have some success. Probably skip the first 35 pages or so, then skim through, noting anything of interest.
 
Last edited:
Macallan
GA-B75M-HD3 |  i7 3770 |  Radeon HD 5570
Good call, I had been reading that thread, but didnt read most of the first 20 pages. Thanks
 
cheyne said:
So to my question, do you think it's possible (or reasonable) to pick up a cheap GTX 950 or something of the like, and install it on of the spare PCI-X 4x slots and only use this for OSX, yet leave my 1080 in the PCI-X 16x for Windows?
Click to expand...
Disabling GTX1080 in DSDT (by address) and removing all other references
Code: 
Device (P0PX) // Change this to whatever
{
Name (_ADR, 0x00010000)  // _ADR: Address
Name (_STA, 0x00)  // _STA: Status
}
 
cubawire said:
Disabling GTX1080 in DSDT (by address) and removing all other references
Code: 
Device (P0PX) // Change this to whatever
{
Name (_ADR, 0x00010000)  // _ADR: Address
Name (_STA, 0x00)  // _STA: Status
}
Click to expand...

Ill see how I go once the 1080 arrives before I try something like this, but if I do, how do I go about retrieving the hardware address and device ID required for the above snip?
 
cheyne said:
Ill see how I go once the 1080 arrives before I try something like this, but if I do, how do I go about retrieving the hardware address and device ID required for the above snip?
Click to expand...
The slot will likely be in the stock DSDT as PEG0 (PCI Express Graphics) and the address will be in that section. The card itself will not be present in a stock DSDT. Depending on which mac model you spoof in SMBIOS you might rename e.g. slot 3 (if that's where you install your OSX video card) to GFX0 or POP1, or something.
 
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You can certainly do as you described. I have been running one of my old GTX 660s as the video card for OS X and running my 1080 for Windows. The key is setting the supported graphics device as the primary graphics device in your BIOS. I did not have to mess with DSDT disabling at all.
 
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