Successfuly installing Yosemite 10.10.5 on Core 2 Duo and P35 chipset
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Hi there, today I was managed to install Yosemite 10.10.5 on an old PC which I bought extremely cheap from a friend, these are :
 
- Core 2 Duo E8400 @3GHz
- Gigabyte GA P35-DS3R v1.0
- Samsung 4x1GB DDR2 PC6400 SDRAM
- NVIDIA Geforce 9800GT 512MB ( unknown Chinese model ) 
- 500GB WD Green SATA
- LG DVDRW
- An ultra high end 10 years old 15" Samsung LCD with 1024x768 res at 75Hz... fully pure of joy :|
 
things for installation :

- I'm using transmac from my windows 10 to create Yosemite Zone 10.10.1 usb installer
- BIOS setup was : AHCI enabled, USB as first boot device, virtualization off, HPET on @64bit, ACPI on
- bootflags with -v at first installation
 
after setup complete
- Multibeast 7.41 for first installation
- I use this custom DSDT = 1166-dsdt-gigabyte-ga-p35-ds3r-f13-rev1.aml
- select audio to Realtek ALC885/889a with optional HDA enabler = audio 1
- kext dev mode and PCIRoot checked -> reboot

- upon restart write GraphicsEnable=Yes and PCIRootUID=1 but i think it wasn't mandatory
 
- download OSX Yosemite 10.10.5 combo update from apple store and slam it
- on reboot write flags -f -x first, it will be one helluva slower boot
- use Multibeast 7.50 afterwards, same options as before with 7.41 -> reboot
- don't forget these flags: GraphicsEnable=Yes and PCIRootUID=1
- download and install Nvidia WebDriver 346.02.03f01 and CUDA driver 6.5.51 reboot
- choose NVIDIA as the default graphics, reboot
- setting the audio via audio MIDI setup and sound over system preferences, mine came out a little bit low on volume, so i installed Boom to boost it up.
 
as for now everything is working just fine as it should, no apps and hardware are having trouble at all.

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