<key>GraphicsEnabler</key>


        <string>y</string>


        <key>PciRoot</key>


        <string>1</string>

Check the Graphics Injection option, click on Auto-detect value in PCIRoot and save.

        <key>device-properties</key>


        <string>[hexadecimal EFI string]</string>

ioreg -lw0 -p IODeviceTree -n efi -r -x | grep device-properties | sed 's/.*<//;s/>.*//;' > device-properties.hex

First about display-cfg. It describes what type of screen is attached.

BYTE: Display-Number
BYTE: I2C Read Offset
BYTE: 0xFF
BYTE: 0xFF

If the unknown condition above is not met its build up as following regarding the type of screen attached.

For ANALOG:

BYTE: Display-Number
BYTE: I2C Read Offset
BYTE: 0xFF
BYTE: 0x00

For TV:

BYTE: Display-Number
BYTE: I2C Read Offset
BYTE: 0xFF
BYTE: 0x01

And for everything else like LVDS, TMDS and Display-Port

BYTE: Display-Number
BYTE: I2C Read Offset
BYTE: DCB Entry OR (guessing)
BYTE: 0x03

There is one display-cfg for each screen. Here an example (note we have to swap bytes to inject):

ANALOG

@0,display-cfg <00FFXX00>  XX = I2C Read Offset
@1,display-cfg <00FFXX01>  XX = I2C Read Offset

TV

@0,display-cfg <01FFXX00>  XX = I2C Read Offset
@1,display-cfg <01FFXX01>  XX = I2C Read Offset

ELSE

@0,display-cfg <03YYXX00>  XX = I2C Read Offset; YY = DCB ENTRY OR VALUE (guessing)
@1,display-cfg <03YYXX01>  XX = I2C Read Offset; YY = DCB ENTRY OR VALUE (guessing)

Now about NVCAP: It describes which outputs can be used simultaneously and the following:

BYTE: NVCAP_VERSION (hardcoded, goes from 0 to 5)
BYTE: HAS_CLAM_SHELL (lid)
BYTE: UNKNOWN (most built-in cards and MacPro 7300GT have that set to 1)
BYTE: UNKNOWN (most built-in cards have that set to 1. something about backlight?)
WORD: OUTPUT GROUP 3 (guessing, it describes what outputs are usable together with S-Video out)
WORD: OUTPUT GROUP 1 (describes what outputs are grouped to Display-A)
WORD: OUTPUT GROUP 2 (describes what outputs are grouped to Display-B)
BYTE:
BYTE:
BYTE:
BYTE:
BYTE: BUILT-IN (guessing, built-in cards apart from 7300GO (AppleTV) have this set to 1)
BYTE: UNKNOWN (hardcoded value)
BYTE: EDID_MANUFACTURER_RESERVED_TIMINGS (BYTE 0x25 of the primary screens EDID)
BYTE:
BYTE:
BYTE: UNKNOWN (MacBookPro 8600MGT (15") 128MB Vram has this set to 1)

About the Output groups, they are generated like following. It all depends on the DCB table in your video bios. You can find your DCB table by looking at offset 0x36 of a nvidia bios. You byte swap the word at 0x36, thats the address of the DCB table.

In the DCB table we have entries describing what type of connection can be used for a physical output, like ANALOG, ANALOG/DVI etc. Let's take an example DCB (iMac 7600GT).

DCB ENTRY 0: ANALOG
DCB ENTRY 1: LVDS
DCB ENTRY 2: TMDS
DCB ENTRY 3: TV

In this case we have LVDS at index 1 (so we set bit 1), it is always alone on an output group. So OUTPUT GROUP 1 would be

hex: 0x0002
binary: 0000 0000 0000 0010

All the other entries will be grouped to OUTPUT GROUP 2, so we have DCB ENTRY 0,2 and 3 (so we set bit 0,2 and 3) grouped which would be

0x000D
binary 0000 0000 0000 1101

As you can see we set bit X (X is the DCB ENTRY INDEX) to group an entry to an output group.

The same is done for OUTPUT GROUP 3, it's just generated when we have a TV entry in our DCB. It would be of big help if somebody with iMac 7600GT an tell us what outputs do work simultaneously with an S-Video adapter since iMac 7600GT is the only one having just the TV entry in this output group.

Now about NVMT: it describes the capabilities of the primary screen:

BYTE: NVMT_VERSION
BYTE: DISPLAY_TYPE (0 = ANALOG, 1 = TV, 3 = the rest)
BYTE: UNKNOWN
BYTE: UNKNOWN
WORD: EDID_MANUFACTURER
WORD: EDID_PRODUCT_CODE
WORD: SCREEN WIDTH
WORD: SCREEN HEIGHT
WORD: SCREEN WIDTH + SOME VALUE
WORD: SCREEN WIDTH + SOME VALUE
WORD: SCREEN WIDTH + SOME VALUE
WORD: ZEROED
WORD: SCREEN HEIGHT + SOME VALUE
WORD: SCREEN HEIGHT + SOME VALUE
WORD: SCREEN HEIGHT + SOME VALUE
WORD: ZEROED
DWORD: SOME VALUE * 10000
WORD:
BYTE:
BYTE:
--BYTE: 
BYTE:
BYTE:
7 DWORDS: ZEROED
BYTE: 0xFF HARDCODED
BYTE: 0xFF HARDCODED6 BYTES: ZEROED
DWORD:
BYTE:
BYTE:
6 BYTES: ZEROED
BYTE:
BYTE:
BYTE:
BYTE:
--WORD: the --BYTE is this value >> 8
BYTE:
BYTE:

Looking at NVMT is quite a mess, too much is unknown yet. If somebody has any further info for instance how to calculate the screen width/height values please help.
NVDA,Features:

SUBSYSTEM_ID << 16 | 0x02FF

built-indevice-type

"NVDA,Parent" (HARDCODED)

Ext_Present@X,built-in, @X,use-backlight-blanking@0,AAPL,boot-display@X,backlight-control@0,name

"NVDA,Display-A" (HARDCODED)

@1,name

"NVDA,Display-B" (HARDCODED)

@X,device-type

"display" (HARDCODED)

@X,compatible

"NVDA,NVMac" (HARDCODED)

IMPORTANT, READ INSTRUCTIONS FROM START TO FINISH BEFORE BEGINNING

part one:

getting card details

use a program called textwrangler, google it, it's an excellent text editor with some
features that will make following this guide alot easier for yourself I promise you,

Creat a text file on your desktop called whatever, i'll call mine info.txt

now copy the corresponding string between the < > below of the Video RAM size your
video card has labelled as "video ram":
the digit after 0x are multiples of 256, the ones after 0x0 are multiples of 16.
<0x08000000> - 128Mb
<0x10000000> - 256Mb
<0x14000000> - 320Mb
<0x20000000> - 512Mb
<0x28000000> - 640Mb
<0x30000000> - 768Mb
<0x38000000> - 896Mb
<0x50000000> - 1280Mb
<0x60000000> - 1536Mb

next choose the type of outputs on the particular card labelled as "connectors":
the connector layout: Mainboard side of card / SLI connector side of card
<BAAAAAAAAwAMAAAAAAAABwAAAAA=> - DVI-I / DVI-I
<BAAAAAAAAQAGAAAAAAAAAAAAAAA=> - VGA / DVI-I
<BAAAAAAAAwAEAAAAAAAABwAAAAA=> - DVI-I / VGA

now complete part one for your second card if you are going with 2 cards, and remember
to keep the details for each card clearly labelled for that card.

Part two:

getting the card location

if your going to use 2 cards, you must do this step twice, starting with your primary
card inserted into your PC without the secondary card in the system, then repeat the
process with the secondary card in the secondary slot it will occupy with the primary
card removed. so in short, get first card location, swap out the card then get the
secondary card location.

this is how:

you need root access, go here to learn how to get it: support.apple.com/kb/ht1528
with your primary or only card installed in the slot you intend to use it in, extract
gfxutil to your desktop, open terminal and type:

su [hit enter]

[enter your root password then hit enter]

cd \Users\[your username]\Desktop\ [hit enter]

./gfxutil -f display [hit enter]

OK once you enter that last line you should get an outpu on screen like:

PciRoot(0x4)/Pci(0x1,0x0)/Pci(0x0,0x0)

label it as "location"

copy it by dragin over with your mouse and right click, copy, then paste into you text
file "info.txt" you recorded you video card details to, if using 2 cards make sure it's
labelled for the card currently in your system then repeat with your second card fitted
to it's slot again, only if you going to use 2 cards.

Your almost done, your info.txt should read something like this:

card a

video ram:0x20000000
connectors:BAAAAAAAAwAMAAAAAAAABwAAAAA=
location:PciRoot(0x4)/Pci(6x1,0x0)/Pci(0x0,0x0)

card b (only if using 2 cards)

video ram:0x20000000
connectors:BAAAAAAAAwAMAAAAAAAABwAAAAA=
location:PciRoot(0x4)/Pci(0x6,0x0)/Pci(0x0,0x0)


part three:

modding the in.plist

this is the part where you cop over your collected data to the template in.plist file.
open it with textwrangler.

locate the text "LOCATION" and paste your location info in it's place.

locate the text "VRAMINFO" and paste your video ram info in it's place.

locate the text "CONNECTORS" and paste your connectors info in it's place.

locate the text "VIDEOCARDNAME" and paste your video card name in it's place.
<key>model</key>
<string>NVIDIA GeForce GTX 275 - 896MB</string> for example.

now if your only using one video card you can delete everything after "</dict>" up until the second
occurrence of </dict>so there will be a total of 2 x </dict> at the end of the file like this:

</dict>
</dict>
</plist>

now procede to part four.

If your using 2 video cards, do the same again for card b

locate the text "LOCATIONB" and paste your location info in it's place.

locate the text "VRAMINFOB" and paste your video ram info in it's place.

locate the text "CONNECTORSB" and paste your connectors info in it's place.

locate the text "VIDEOCARDNAMEB" and paste your video card name in it's place.
<key>model</key>
<string>NVIDIA GeForce 8800GT- 512MB</string> for example.


part four:

this part is where you convert your in.plist to an EFI string.

save your info.txt and in.plist.

Open terminal again with root access and type:

cd /Users/[your username]/Desktop/

./gfxutil -i xml -o hex ./in.plist ./out.hex

ok, now open the out.hex file with textedit, hit Command + A to select all and Command + C
to copy to your clipboard.

go back to terminal and type:

nano /Library/Preferences/SystemConfiguration/com.apple.Boot.plist

this opens up the nano text editor, use the arrow keys to go </dict> and enter a line
above it indented just like the others above that, and enter:

<key>device-properties</key>
<string>"PASTE EFI STRING HERE"</string>

so when your done it will look like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs$
<plist version="1.0">
<dict>
<key>Graphics Mode</key>
<string>1920x1200x32</string>
<key>GraphicsEnabler</key>
<string>Yes</string>
<key>Kernel Flags</key>
<string></string>
<key>device-properties</key>
<string>ce0700000100000002000000e20300001500000002010c00d041030a04</string>
</plist>

The EFI string you paste may look wierd but as long as it has no leading or trailing
spaces between <string>and</string> you all good.

now to save the file, you press Control + X, then hit Y to confirm overwrite of old file.

Your done. Shutdown the PC, install all video cards into their slots and Boot the PC, and it
should work, if not, try NVEnabler.kext for single cards, or research the forums and OSX
HCL pages on the OSX86 Wiki links above. This is AFAIK the only way to get 2 differing
NVIDIA cards to work in the same OSX system.

<key>MacPro5,1</key>
                                 <dict>
                                         <key>Vendor10deDevice1081</key>
                                         <dict>
                                                 <key>Heuristic</key>
                                                 <dict>
                                                         <key>ID</key>
                                                         <integer>0</integer>
                                                         <key>IdleInterval</key>
                                                         <integer>250</integer>
                                                         <key>SensorOption</key>
                                                         <integer>1</integer>
                                                         <key>SensorSampleRate</key>
                                                         <integer>4</integer>
                                                         <key>TargetCount</key>
                                                         <integer>5</integer>
                                                         <key>Threshold_High</key>
                                                         <array>
                                                                 <integer>0</integer>
                                                                 <integer>45</integer>
                                                                 <integer>75</integer>
                                                                 <integer>100</integer>
                                                         </array>
                                                         <key>Threshold_Low</key>
                                                         <array>
                                                                 <integer>0</integer>
                                                                 <integer>0</integer>
                                                                 <integer>87</integer>
                                                                 <integer>98</integer>
                                                         </array>
                                                 </dict>
                                                 <key>LogControl</key>
                                                 <integer>1</integer>
                                                 <key>control-id</key>
                                                 <integer>18</integer>
                                         </dict>
                                         <key>default-control-id</key>
                                         <integer>18</integer>
                                 </dict>

High performance thresholds:
(focused on G-state 1 (caution) this mode still switches quickly between 2 and 1 
Threshold_High
0
85
75
100
Threshold_Low
0
0
95
98

<key>MacPro5,1</key>
                                 <dict>
                                         <key>Vendor10deDevice1081</key>
                                         <dict>
                                                 <key>Heuristic</key>
                                                 <dict>
                                                         <key>ID</key>
                                                         <integer>0</integer>
                                                         <key>IdleInterval</key>
                                                         <integer>250</integer>
                                                         <key>SensorOption</key>
                                                         <integer>1</integer>
                                                         <key>SensorSampleRate</key>
                                                         <integer>4</integer>
                                                         <key>TargetCount</key>
                                                         <integer>5</integer>
                                                         <key>Threshold_High</key>
                                                         <array>
                                                                 <integer>0</integer>
                                                                 <integer>85</integer>
                                                                 <integer>75</integer>
                                                                 <integer>100</integer>
                                                         </array>
                                                         <key>Threshold_Low</key>
                                                         <array>
                                                                 <integer>0</integer>
                                                                 <integer>0</integer>
                                                                 <integer>95</integer>
                                                                 <integer>98</integer>
                                                         </array>
                                                 </dict>
                                                 <key>LogControl</key>
                                                 <integer>1</integer>
                                                 <key>control-id</key>
                                                 <integer>18</integer>
                                         </dict>
                                         <key>default-control-id</key>
                                         <integer>18</integer>
                                 </dict>

1) remove anything permitted to audio enabling (AppleHDA, VoodooHDA, AppleAzaliaAudio, etc..)
2) Run Disk Permissions with Disk Utility, Kext Wizard, Kext Utility... (Prefer running Disk Utility and then Kext Utility)
3) Reboot
4) Put the AppleHDA.kext to System/Library/ Extensions
5)Put the ALC662.kext on Extra/Extensions
6) Put the dsdt.aml to /Extra
7) Run Terminal and type this:

sudo perl -pi -e 's|\x85\x08\xec\x10|\x62\x06\xec\x10|g' /System/Library/Extensions/AppleHDA.kext/Contents/MacOS/AppleHDA

8) Run Disk Utility first and then.. kext utility
9) Reboot
10) If it worked, go eat rice