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The FirePro v7900 seems to be either an upgrade or downgrade from either the HD 6950 ot the HD 6970.

I have this card booting Display Port to DP ACTIVE adapter to HDMI or DVI on monitor in High Sierra but . . it boots via Safe Boot.= no acceleration.
 
I just looked in the High Sierra Sys/Libs/ Extensions/ AMD6000Controller.kext and found this  ..

<string>Safe Boot</string>

If I remove this line. will the FirePro v7900 still boot up ?

Any help, suggestions, advice greatly appreciated.

( at the bottom of the following text in RED text )

<key>OSBundleLibraries</key>
   <dict>
      <key>com.apple.iokit.IOACPIFamily</key>
      <string>1.2</string>
      <key>com.apple.iokit.IOGraphicsFamily</key>
      <string>1.3</string>
      <key>com.apple.iokit.IOPCIFamily</key>
      <string>1.2</string>
      <key>com.apple.kext.AMDLegacySupport</key>
      <string>1.6.8</string>
      <key>com.apple.kpi.bsd</key>
      <string>8.0.0</string>
      <key>com.apple.kpi.iokit</key>
      <string>8.0.0</string>
      <key>com.apple.kpi.libkern</key>
      <string>8.0.0</string>
      <key>com.apple.kpi.mach</key>
      <string>8.0.0</string>
   </dict>
   <key>OSBundleRequired</key>
   <string>Safe Boot</string>
</dict>
</plist>