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ATI/AMD 5xxx 6xxx 7xxx 2xx 3xx Graphics Cards Framebuffer Personalities

Yes, both non-reference GCN 1.0 cards and all GCN 1.x cards will have to either use RadeonFramebuffer or modify an existing one.
The first option should usually work flawless with GCN 1.0 cards (e.g. 7770[needs Info.plist patch], 7850, 7950, 7970), I did some tests on my own and even read about successful Eyefinity setups (5 or 6 screens from one card).

GCN 1.1 and GCN 1.2 still seems to be in beta stage. Just received a HD 7790 for testing (Bonair, GCN 1.1, aka R7 260 and R7 360). Works fine OOB but driver will crash immediately when attaching a 2nd screen. :D Will see if a framebuffer patch improves stability.
GCN 1.2 is a little better I guess, because it's already sold in 5K iMac (in contrast to GCN 1.1 - quite surprising this stuff even works).

In my opinion this framebuffer stuff isn't a big issue for Hackintoshs. RadeonFramebuffer does a quite good job, and even if it doesn't you can still patch a framebuffer to match your card. Using Clover this is quite simple, set it and forget it.
Not that easy on a real MacPro though, no bootloader there to handle the kext patching.
 
7xxx/2xx Framebuffer Personalities
GraphicsEnabler=No
Aji
Buri
Chutoro
Dashimaki
Ebi
Gari
Futomaki
Hamachi
OPM
Ikura
IkuraS
Junsai
Kani
KaniS
DashimakiS
Maguro
MaguroS

This is completely wrong, R9 290X uses AMD8000Controller.kext and the only Framebuffers that it uses are Exmoor and Baladi
 
I'm using a ATI Radeon HD 5450 1024MB XFX using Eulemur FB and 3 ports don't need to inject with this card I've made an edit in a DSDT. Graphics Injection seems to be broken in 10.10.4
 

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How do we get this to work in yosemite with an ati 6950/6970?

I second this. I've been trying to get a 6970 working for a few weeks, but have been foiled by the white screen problem. Changing frame buffers doesn't seem to help. No white screen with safe mode (-x). I really wanted this card to work to take advantage of its capabilities for Final Cut Pro, but almost ready to put the 9800GT back in.
 
Did anyone know how to fix sleep issue in El Capitan Radeon 6870 ?
Please delete , i am sorry, seems this topic about only framebuffer and my question is offtopic
 
Change Entire File Content: org.chamelion.Boot.plist
Location: (BootDrive)/Extra/org.chamelion.Boot.plist
How to open This File: download plist editior through Internet.

download: https://drive.google.com/folderview?id=0ByCvtZgOaYP2UzFDMGZDQ1ZhRTA&usp=sharing

Your
AtiConfig=XXXX (Change... Below)

Sapphire AMD Radeon HD 6850: XXXX=Bulrushes (Frame buffer)
AtiPorts=4
Device ID: 0x6739
Vender ID: 0x21F81458


Other Cards: AMD Radeon HD 6850: Frame Buffer: XXXX=Duckweed
AtiPorts=(Check and add a number_How many ports do u have_ex:-DVI-Vga-HDMI-DP)
Mostly 4-Ports
Device ID: 0x6739
Vender ID: different....


=============================
org.chamelion.Boot.plist
============================='

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>AtiConfig</key>
<string></string>
<key>AtiPorts</key>
<string>4</string>
<key>EHCIacquire</key>
<string>Yes</string>
<key>EnableC3State</key>
<string>Yes</string>
<key>EnableDualLink</key>
<string>Yes</string>
<key>EnableHDMIAudio</key>
<string>Yes</string>
<key>EthernetBuiltIn</key>
<string>Yes</string>
<key>ForceWake</key>
<string>Yes</string>
<key>GenerateCStates</key>
<string>Yes</string>
<key>GeneratePStates</key>
<string>Yes</string>
<key>Graphics Mode</key>
<string>1920x1080x32</string>
<key>GraphicsEnabler</key>
<string>Yes</string>
<key>Instant Menu</key>
<string>Yes</string>
<key>Kernel Flags</key>
<string>-v USBBusFix=Yes EthernetBuiltIn=Yes ahcidisk=1 debug=8 dart=0</string>
<key>Legacy Logo</key>
<string>Yes</string>
<key>PrivateData</key>
<string>No</string>
<key>RestartFix</key>
<string>No</string>
<key>ShowInfo</key>
<string>Yes</string>
<key>Theme</key>
<string>Yosemite-X</string>
<key>UHCIreset</key>
<string>Yes</string>
<key>UseIntelHDMI</key>
<string>Yes</string>
<key>UseKernelCache</key>
<string>Yes</string>
<key>UseMemDetect</key>
<string>No</string>
<key>Wake</key>
<string>Yes</string>
</dict>
</plist>

==================================
 
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