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Windows 8.1 64-bit driver for Coprocessor on Mid 2009 Macbook Pro 5,4

I have successfully installed Windows 8.1 Pro 64-bit onto my Mid 2009 Macbook Pro 5,4. The installer from BootCamp 5.0.533.5033 would not run, but I installed one-by-one the files under Apple and then ran the 64-bit nVidia installlers. I have everything present and accounted for except for the 'Coprocessor.'


I have looked through the forums and everything seems to indicated that if you install the nVidia drivers it will install the driver for this but it doesn't. Any thoughts/suggestions/solutions?

MacBook Pro, Windows 8

Posted on Jan 27, 2014 9:08 AM

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32 replies

Jan 27, 2014 1:21 PM in response to Rudegar

While I understand what you're saying, it really doesn't help me. So far the OEM release of WIndows 8.1 installed base drivers for the hardware with no issues what-so-ever for booting, and supplementing it with the drivers from BootCamp 5 have caused everything to be resolved for driver conflicts outside of the one previously mentioned Coprocessor driver error.

Feb 26, 2014 3:05 PM in response to getsutora

For anyone who will find this post in the future, the Device Manager indicates that the 'Device Instance Path' is


pci co-processor pci\ven_10de&dev_0aa3&subsys_cb7910de&rev_b1\3&21436425&0&1d

Searching for that online, it appears that this is the nVidia MCP79 Co processor System.


This driver did not install with version 306.37 that came with the BootCamp drivers. I downloaded the current version from nVidia of 334.89 and that didn't work either. I searched online and found a driver for an Alienware 17x that uses the same co processor and ran the installer which extracted the files for the nVidia chipset v. 15.57 for 64-bit Windows 7 and Vista to c:\dell\drivers\R273039 and pointed the Device Manager to this folder and it was able to successfully install the driver software for the Management Controller (drivers are listed under the SMU folder for the "PCI\VEN_10DE&DEV_0AA3" device).


NVIDIA nForce System Management Controller



I then proceeded to use Double Driver to backup the drivers in use by the system so that if I install Windows 8 on future systems I can use this rather than the round-about way of getting the driver installed on the system.

Oct 28, 2014 2:31 PM in response to Loner T

Hi Loner T

If I go into boot camp Support Software 4.0.4033 and then open up to bootcamp then drivers then NVidia which one do I install to correctly get the drivers for Coprocessor and Sm Bus Controller ? etc....... which file folder? NVidiaChipset32 or NVidiaChipset64 or Win7_32 or Win7_64. thanks

As I have a White MacBook 13 inch os x lion 10.7.5 mid 2010 and which I have but windows 8 on. Thanks

Windows 8.1 64-bit driver for Coprocessor on Mid 2009 Macbook Pro 5,4

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