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my GigaByte UD3R works after I disabled the IDE-controller in BIOS (gigabyteSata2). I had 2 HD - 1 SATA in AHCI mode (macOS) + 1 IDE - I am running now only Sata. I am very happy after experimenting for 2 months...(ram downclocking, ICH-voltage downclocking, cpu-voltage.....) iDeneb v1.4 (10.5.6) updated to 10.5.7 an other OS intalled (iDeneb 10.5.6) updated from Apple, seems to work fine...(testing it...) GigaByte UD3R Intel q9550 NVIDIA GeForce 8600 GTS 4GB ram-OCZ platinum WD 750 black caviar