I have a GA-MA790XT-UD4P I have tried many different distros to OSX installed on this System and only 1 comes close. "Snow Leopard Client-Server 10.6.2 SSE2/SSE3 Intel AMD" It installs and says successful. Then reboots almost loads and kernel panics. with panic(cpu 0 caller 0x2a7e57): I have successfully installed OSX on my intel based laptop. And i remember having to patch the dsdt before the install. but hat version osx3.6 does not work with amd it seems and the 3.6a version i found just constantly reboots the pc when it trys to load. Anyone got a guide for this or was able install it correctly?

Thanks in advance

System Specs
GA-MA790XT-UD4P
ATI 4850 HD
4 Gigs Ram.

This is solved for the ATI 4850HD Figured out I had to remove all geforce kexts nvidia and other ATI to fix kernel panic this has to be done -x safe mode. Cant be done during install.

Side note here i just tried -x and was able to boot into safe boot. but well thats only a slight improvement

I am using SL on this mobo.
First I got it working with "Snow Leopard Client-Server 10.6.2 SSE2/SSE3 Intel AMD", then I installed from retail DVD.
Which kexts/patches/kernel have you selected during install of SL Client-Server ?

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Gone Linux.

Obviously all the wrong ones. lol. i tried using black nights kernal. the cmos fix the ataati going from memory here. usb fix realtek 1000 driver. ati injector. but by retail install. what do you mean? i installed the Snow Leopard Client-Server 10.6.2 SSE2/SSE3 Intel AMD. there is another iso i need after this? when i installed it on my laptop i used osx3.6 but thats an intel cpu. right after i installed hazards iso it reboots to give me the panic(cpu 0 caller 0x2a7e57): kernel trap at 0x5ceadc07, type 14=page fault.

By retail install I mean buying Mac OS X Snow Leopard Install DVD, booting it with Empire EFI, Chameleon or sth similar and simply installing it.
When you install SL from distro, you should select only the most important patches and kexts, and if it boots successfully get the rest of hardware working (audio/ethernet/graphics etc.).
When I installed SL with the Client-Server distro, I selected only blackknight's kernel, ElliotForceLegacyRTC and Chameleon 2 RC4 bootloader. Then I got ethernet working with Realtek1000SL kext, audio with VoodooHDA 0.2.6.2 and graphics with EFI string (you may need something else for your HD4850 though).

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Gone Linux.

i have the phenom x4 B50, well dual core unlocked any bios settings i might be missing. i turned on the achi but never turned off the gsata because i needed it for dvd sata that dont work in achi mode.

Have you tried installing SL Client-Server with only kernel and EvoLegacyRTC yet ?
Anyway, here are my BIOS settings (sorry for the quality, I don't have my camera at the moment).
http://i31.tinypic.com/k3vsz6.jpg
http://i30.tinypic.com/22kog.jpg
http://i27.tinypic.com/334lw1v.jpg
http://i26.tinypic.com/2mpeyqc.jpg

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Gone Linux.

I had my settings exactly like that when i tried to install "Snow Leopard Client-Server 10.6.2 SSE2/SSE3 Intel AMD" I picked just the kernel Knights and EvoLegacyRTC it installs perfectly. its the running after the install. thats the problem thats when i get that kernel panic. Am i supposed to be using any flags? ive tried maxmem=4096 fsb=200000000 fsbratio=150 the only thing that works is -x to get into safe mode but barring that none of those flags has made any difference they all kernel panic.

I have the Phenom X2 550 BE CPU. witch I unlocked the quad core on to a Phenom X4 B50. I reducued the the fsb to X15 to get under the 3.0 ghz or i would not even install. I have tried it with it as a B50 and a 550 at 3.0 both fail. The error is Panic(cpu 0 caller 0x2a7e57): kernel trap at 05ceadc07, type 14=page fault, Ill try to include a screen shot when i get off work and can log out of windows The "0" after cpu changes some time 1 2 or 3.

Maybe one of the cores you've unlocked isn't OK (so AMD locked it and sold the processor as dual core). Try turning off ACC and set the multiplier to default value (it was x16, right?).

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Gone Linux.