The Retina MacBook Pro models with dual GPUs do not provide for use of the integrated Intel Graphics device; only the dedicated Nvidia GPU is recognised in Windows Boot Camp. Thus no Intel 5200 graphics driver is needed. This significantly reduces battery life when running Windows in Boot Camp on these models but as far as I know no solution has yet been found to allow graphics switching in Windows.
the switching between the 2 graphic cards is possible. still in windows 7, you have to do this from bios.
to do the same since windows 8, you have to restart in safe mode.
and i assure it works.
why i want to turn off the nvidia graphic card? because the support for opencl isn't awesome as the cuda one, obvious.
and the iris is like 2 time and more faster than the the nvidia one running luxrender and luxmark to benchmark the opencl.
both use opencl, and luxmark as i know became officially the apple app to benchmark their opencl support.
Wow, I didn't know that was possible! I have Windows 7 installed but will give this a try with my Windows 10 TP test system. Thanks for the tip!
I was able to manually install the Intel HD Graphics drivers on my 13" rMBP with Windows TP installed in Boot Camp by:
- Deleting the reference to Threshold in the configuration file that prevented installation with Windows Technical Preview
- Modifying the first line in the Windows 8.1 setup section header to [IntelGfx.NTamd64.6.4]
- Restarting in Windows Troubleshoot mode to allow installation of drivers not digitally signed
You need to manually install the driver:
- Download the latest Beta x64 Version (10.18.14.4072 64-bit version)
- Delete the following entry in the configuration file ( igdlh64.ini ) :
;no install on Threshold
- Modify the Windows 8.1 setup entry to:
; Windows 8.1 Install
- Restart the system in Recovery Mode (Advanced Startup) and select the option to allow installation of unsigned drivers
- Enter Device Manager and install the graphics driver manually be selecting the modified .ini configuration file
The latest Beta version is available here:
However, when I tried to disable my NVidia discrete graphics card on a rMBP 15" running Windows TP in Boot Camp, the Intel Graphics chip wasn't listed under Device Management upon restarting, so I wasn't able to install the HD Graphics driver manually. I don't have Windows 8.1 installed anywhere (I prefer Windows 7) so I can't test this under that operating system. But unless the integrated graphics device is listed somewhere else in Device Management it doesn't seem to be recognized in Windows TP even after disabling the discrete graphics device.
this is exactly the problem, the iris is not listed. even you uninstall the nvidia card drivers there from device manager(the only working way), once you reboot the macbook you open display setting or device manager you will see that you have the microsoft monitor adapter, or whatever it is called. if you run the nvidia drivers, then the nvidia card will be again visible and available without reboot, while the iris drivers can't be just installed.
the file to which you refer should be now this Setup.if2? not an ini anymore
is there a way to safely place manually the files in the system?
i may try copying the intel folders, and the registry entries from my windows7 , to my windows 10 partition on mbp.. and see if after registering the registry keys i can install the iris drivers. or is this a stupid idea?
PS: yesterday, on my yosemite, luxmark benchmarked the iris opencl with a score of 4450 while the nvidia 750 opencl with only 1156
i had to roll back to win 8.1 because of stability issue.. beside in win 10 scanning the directory for *.ini files returned 0
i found this igdlh64.ini but there is no way to install the drivers,
1 because in safe mode the iris is not listed as device
2 even unistalling the drivers for the nvidia components.. the iris is like a stealth..
Well, the Windows 10 Consumer Preview is just around the corner so you may have better luck with that.
Were you able to "see" the Intel Graphics in Device Manager after reverting back to Windows 8.1? I may just give that a try since I only need the NVidia dedicated graphics in Windows for gaming. I assume you can enable the NVidia device at any time when needed (albeit in Safe Mode)?
i started a new topic on apple.. and maybe i found an explanation.
i couldn't access the bios for the windows since it is a macbook pro.. we have to accesss the firmware.. but still trying to get to it.
not that easy as i thought.