i agree with roisoft the GA-P35-DS4 is the most compatable motherboard for osx on the market today. I plan on getting it in a month

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Current Rigs:
Main Hack:
Processor:Intel Core 2 Duo E8400 Wolfdale
Motherboard:Gigabyte EP35-DS3L
Ram: Gskill 4GB DDRII 800 PC2-6400
Video Card: Nvidia GeForce 8800GT 512MB
Running Retail OSX 10.5.6 PC-EFI V9

TV Hack:
Processor: AMD Athlon x2 3800+
Motherboard: MSI K9mm-V
Ram: 1GB DDR2 667
Video Card:ATI Radeon X1650 (AGP)
Running iDeneb 10.5.6 with Voodoo XNU 9.5.0 Kernel