My FX 8350 running on an Asus Sabertooth FX990 rev1 runs fine and windows 8 pops up. BTW wow that's the longest run on sentence I've ever seen. I know you are upset and I would be also.
May I ask if you installed all of the chipset drivers for your mb? Did you check device manager in windows to see if you are missing any device drivers? Truthfully that's the first time I've ever heard of this problem. What CPU cooler are you using? Have you run just 1 6970 to see if this problem occurs?
Asus Sabertooth FX990 R1 | FX 8350 @ 4.64Ghz with Corsair H100 p/p| EVGA GTX670 FTW | HAF 912 | 8g Gskill DDR3 1600 |Intel X25M-80 (OS); WD Blk Sata III 500g | Hanns HZ 281 | Win 8 Pro