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Powercolor Hd 5670 Artifacting


cheo
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Hi, any help would be appreciated!!!!

 

SPECS

Custom rig using Mac Pro 3,1 SMBIOS ML 10.8.2

CPU: AMD phenom II x 4 955 (black edition runnng stock 3.2 Ghz) using Sinetek 10.8 patched kernel

Graphics: Powercolor ATI HD5670 (DDR3 1gb) (http://www.powercolor.com/global/products_features.asp?id=308)

Ram: 8GB Ram: 2 x Kingston 1333MHz 4gb modules (Part Number 99U5458-005.A00LF)

Mobo: ASUS M4A88TD-M/USB3 (http://www.asus.com/Motherboards/M4A88TDM_EVOUSB3/)

STORAGE :

DVD DRIVE

HL-DT-ST DVD-RAM GH10L DVD-R/RW drive

HDDs (ALL HDDs set on AHCI via bios)

160GB Seagate ST3160815AS (SATA II [fully functional Snow Leopard Partition, 10.6.8])

1TB Seagate ST31000524AS (SATA III [Windows 7 x64])

160GB Western Digital WDC WD1600AAJS-22PSA0 (SATA II [Mountain Lion])

Currently booting using boot flags: PCIrootUID=1 Cpus=4 Busratio=16 GraphicsEnabler=Yes (changing this doesn’t make a difference)

 

I have not been able to get proper working graphics using my powercolor HD 5670 on OSX 10.8.2, after many (and I mean a lot) attempts over the past few months. By attempts I mean using different sets of kexts etc. Display is set on the right resolution and QE/CI appears to be enabled  (though I’m guessing only partially=transparent menu bar) however I frequently get graphics artifacts on my screen, making osx virtually unusable. Everything other than my graphics is working e.g. sound, networking (internet) etc in ML. I also have a working snow leopard setup, with graphics fully functional at my disposal. I'm taking a huge guess here (note my sarcasm) but I believe this to be the root of my problems:

post-1144943-0-05914700-1376749965_thumb.jpg

 

My powercolor card is working fine in Windows 7 & SL 10.6.8. Display is set to 1366x768x32 in ML (using a small monitor). I have tried using a lot of different Apps and the results are the same, even when disabling hardware acceleration options (where available)

 

post-1144943-0-97041600-1376749436_thumb.png  

post-1144943-0-60137300-1376749453_thumb.png

post-1144943-0-65771000-1376749464_thumb.png

post-1144943-0-76098800-1376749476_thumb.png

post-1144943-0-27030200-1376749491_thumb.png

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post-1144943-0-61116900-1376749513_thumb.png

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and the grand finale...

post-1144943-0-04600500-1376749545_thumb.png

 

Any help would be greatly appreciated. thank you

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