My a8n-sli gives me 0x0000009c stops occasionally. I tried installing an audigy 2zs gamer sound card and that stops it from booting. It gets to the Windows progress bar and then gives the 0x0000009c stop code. I notice that the motherboard announces that the POST is completed with the onboard sound enabled but with it disabled and the sound card installed it does not make that announcement. I RMA'd the card and it worked once with the new card. then, the stop code and it would not reboot. I tried both sticks of ram and then just one and then just the other. I pulled the only other pci card i had, my wifi adapter card. It still wouldn't boot . I tried the card in different PCI slots, still won't work. I had my comp set up with RAID but I realized there wasn't much point to that so I formated and reinstalled windows w/o RAID to see if that made a difference, no. The highest temp my cpu gets to is 44c. Possibly related to the problem is a phantom device, windows keeps detecting an unknown PCI device and wanting to install it.
A8N-SLI motherboard
Athlon 64 3200
ASUS 6600GT PCIx card
1G Kingston Ram (512, 512)
Windows XP home edition
Antec NEO 480 w power supply
Sony 710 DRU DVD
WD Raptor 74G HD
WD Raptor 74G HD