I managed to install Mac OS X 10.5.8 on an AMD Athlon X2 system after little trouble. I’ll post the procedure to make sure if I have to do it again I can easily refer and someone trying to do the same can save the trouble. This will be composed of a series of posts, a post per step.
In the mean time find out the specifications of your box. I’m using GIGABYTE GAPM61SME-S2 motherboard with AMD Athlon X2 CPU. If your specifications are just like mine go ahead and download all the files listed bellow, otherwise download 1-3 and then look for kexts for your motherboard.
System specification
- AMD Athlon X2 2800
 - nVidia GeForce 6100/nForce 405 chipset
 - 1 x 2 GB of DDR2 DIMM
 - On board ethernet (nForce 10/1oo Mbit)
 - Realtek ALC883 CODEC chip
 - SATA HDD (nForce sata controller)
 - USB Mouse
 - USB Keyboard
 - DVD Drive
 
Downloads
- iPC OSx86 Leopard 10.5.6 Intel AMD SSE2 SSE3 DVD (Google and find out, you will have to download via Bit torrent)
 - Mac OS X 10.5.7 Update (http://keti.ws/95282)
 - Mac OS X 10.5.8 Combo Update (http://keti.ws/95283)
 - nForceLAN (http://keti.ws/94281)
 - AppleNForceATA (http://keti.ws/95281)
 
Steps
- Patch the iPC DVD image (Otherwise the DVD will never boot)
 - Install Mac OS X 10.5.6
 - Remove all Intel kexts (Improves the boot time)
 - Install Mac OS X 10.5.7 update
 - Install Mac OS X 10.5.8 update
 
Await step 1, Patching the iPC DVD image tomorrow.