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Dual boot Windows 8.1 and Mac OS X Yosemite: How to Guide (?)

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KostasK75

KostasK75

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Feb 27, 2015
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Motherboard
Windows 8.1 Pro
CPU
Intel Core i7 3770K, 3.5 GHz
Graphics
nVidia GTX580
Mac
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Classic Mac
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Hello.

I am new to this forum. I have a PC with Windows 8.1 Pro x64, non-EFI configured Award BIOS, Core i7 3770K, 3.50 GHz, 8GB RAM, 256GB Samsung SSD 840 Pro for the Windows installation (and 3 other HDDs for Storage), nVidia GTX580 graphics card, Asus P8-Z77 Deluxe motherboard.
I want to use my PC and get it configured as Dual boot with an intro screen to let me choose from menu, on e.g. 10 sec, which OS I want to boot, Windows 8.1 Pro or OS X Yosemite 10.10.2.
I have found this wonderful guide on how to install Yosemite using a 8GB USB stick: http://www.tonymacx86.com/yosemite-...-x-yosemite-any-supported-intel-based-pc.html
But the guide does not mention dual booting, I understand that this guide is to install only Yosemite on PC, no dual boot. So, is there a same guide but for dual boot configuration (Windows 8.1 Pro and OS X Yosemite 10.10.2) ???

Thank you.
 
KostasK75 said:
Hello.

I am new to this forum. I have a PC with Windows 8.1 Pro x64, non-EFI configured Award BIOS, Core i7 3770K, 3.50 GHz, 8GB RAM, 256GB Samsung SSD 840 Pro for the Windows installation (and 3 other HDDs for Storage), nVidia GTX580 graphics card, Asus P8-Z77 Deluxe motherboard.
I want to use my PC and get it configured as Dual boot with an intro screen to let me choose from menu, on e.g. 10 sec, which OS I want to boot, Windows 8.1 Pro or OS X Yosemite 10.10.2.
I have found this wonderful guide on how to install Yosemite using a 8GB USB stick: http://www.tonymacx86.com/yosemite-...-x-yosemite-any-supported-intel-based-pc.html
But the guide does not mention dual booting, I understand that this guide is to install only Yosemite on PC, no dual boot. So, is there a same guide but for dual boot configuration (Windows 8.1 Pro and OS X Yosemite 10.10.2) ???


Thank you.
Click to expand...

This is a great resource:

http://www.tonymacx86.com/multi-booting/96000-guide-dual-booting-mountain-lion-windows-8-a.html

Good luck
 
Genesis
GA-Z97X-UD5H-BK |  i7 4790K |  GTX 970 G1 Gaming
emjay96 said:
This is a great resource:

http://www.tonymacx86.com/multi-booting/96000-guide-dual-booting-mountain-lion-windows-8-a.html

Good luck
Click to expand...

2 questions:

1) Is this the same procedure exactly for Windows 8.1 Pro and Yosemite 10.10.2 ?

2) Also, very important (assuming that the answer to question (1) is "yes"): I already have Windows 8.1 Pro installed at my SSD drive, and I think that the guide refers to clean drive to first install Windows then Mac OS X. Should I assume that I follow the "Installing Win8 and Mountain Lion on the same HDD" process, then use a utility (like Ease US Partition Master) to create a Mac OS X Partition, then start the Mac OS X installation process from the "Once you have Win8 to your liking, boot with UniBeast and install OS X Mountain Lion to the second partition." paragraph onwards?

Please advice.

Thank you.
 
KostasK75 said:
2 questions:

1) Is this the same procedure exactly for Windows 8.1 Pro and Yosemite 10.10.2 ?

2) Also, very important (assuming that the answer to question (1) is "yes"): I already have Windows 8.1 Pro installed at my SSD drive, and I think that the guide refers to clean drive to first install Windows then Mac OS X. Should I assume that I follow the "Installing Win8 and Mountain Lion on the same HDD" process, then use a utility (like Ease US Partition Master) to create a Mac OS X Partition, then start the Mac OS X installation process from the "Once you have Win8 to your liking, boot with UniBeast and install OS X Mountain Lion to the second partition." paragraph onwards?

Please advice.

Thank you.
Click to expand...
See http://www.tonymacx86.com/multi-booting/133940-mavericks-windows-8-same-drive-without-erasing.html for problems incurred with attempting to install OS X on a Windows 8 without prior planning and drive setup.

The procedure will work the same for Win8 and Yosemite as it does for Win8 and ML. And, no, you do not need any other drive utility to format the drive.

I really recommend that you use a separate drive for OS X now that you have already installed Win8.
 
Did it work out for you? I already have Windows 8.1 installed but haven't configured the BIOS (I installed before I got a response in my own thread). I have a 120GB SSD on its way, so that I can use it with OS X. I was thinking if I could update the BIOS right before I install OS X or if it is best to just start over and install Windows & OS X from scratch & using the recommended BIOS settings for OS X at first boot.
I will be using Clover bootloader.
 
blasterweb said:
Did it work out for you? I already have Windows 8.1 installed but haven't configured the BIOS (I installed before I got a response in my own thread). I have a 120GB SSD on its way, so that I can use it with OS X. I was thinking if I could update the BIOS right before I install OS X or if it is best to just start over and install Windows & OS X from scratch & using the recommended BIOS settings for OS X at first boot.
I will be using Clover bootloader.
Click to expand...

If you plan to use Clover, then you need do nothing on the Win8 side - just disconnect the Win8 drive, Install OS X drive and install OSX, then shutdown, reconnect the Win8 drive and reboot to BIOS to set OS X drive first in BBS boot order.

BIOS settings for Win8 install that might not work well for OS X
VT-d = disabled for OS X, Win8 does not care if changed
SATA Mode - set AHCI for OS X, if Win8 installed with it set to IDE, need to change it in Win8 to install drivers first before changing settings.
Secure boot - requires complete re-install if this setting was enabled when Win8 was installed.
Quick boot - disable for OS X
 
Going Bald said:
If you plan to use Clover, then you need do nothing on the Win8 side - just disconnect the Win8 drive, Install OS X drive and install OSX, then shutdown, reconnect the Win8 drive and reboot to BIOS to set OS X drive first in BBS boot order.

BIOS settings for Win8 install that might not work well for OS X
VT-d = disabled for OS X, Win8 does not care if changed
SATA Mode - set AHCI for OS X, if Win8 installed with it set to IDE, need to change it in Win8 to install drivers first before changing settings.
Secure boot - requires complete re-install if this setting was enabled when Win8 was installed.
Quick boot - disable for OS X
Click to expand...

Thank for this! I checked my BIOS settings and Secure Boot State is disabled in BIOS and "unsupported" in msinfo32 window, so I don't have to re-install Win8.1, yay. I disabled VT-d and SATA mode was already AHCI and Quick Boot was already disabled. I won't be using my graphics card with OS X either, only the integrated one on OS X and the dedicated one on Windows 8.1, so I just left Display Order to PCIE slot 1 and not IGFX. Now I'm just waiting for my SSD to arrive so I can install Yosemite :thumbup:
 
blasterweb said:
I won't be using my graphics card with OS X either, only the integrated one on OS X and the dedicated one on Windows 8.1, so I just left Display Order to PCIE slot 1 and not IGFX. Now I'm just waiting for my SSD to arrive so I can install Yosemite :thumbup:
Click to expand...
This is not going to work. What GPU are you using?

Please follow the rules and put your hardware in your profile.
 
Going Bald said:
This is not going to work. What GPU are you using?

Please follow the rules and put your hardware in your profile.
Click to expand...

Oh, ok. I use AMD Radeon HD 6950 currently, but I will take it out if does not work with OS X and get a GTX 970 in a couple of months, won't be using it right now anyways. I have updated my profile now
 
blasterweb said:
Oh, ok. I use AMD Radeon HD 6950 currently, but I will take it out if does not work with OS X and get a GTX 970 in a couple of months, won't be using it right now anyways. I have updated my profile now
Click to expand...

Have you tried a forum search to see if anyone has the 6950 working? Seems I remember the 69xx series cards getting support in ML or Mavericks back in 2013/early 2014.

You do realize the 970 is not natively supported in OS X and needs nVidia web drivers to work?
 
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