HELP！！ Rig with 6x 280x setup

[henrylu1988]

Hi,
I have a rig with following setting:

CPU: G1610
RAM: 4GB
MB: MSI Z77A-G45
GPU: 6x Asus R9 280x
PS: CoolerMaster 1000W
      Corsair 800W
OS: Window 8.1 64 bit
Catalyst 13.11
GUIminer v0.04

I was able to detect 6 GPUs in window 8.1 but driver is not working, still showing explanation mark.
Only work with 5 GPUs.

any one would be able to help me? please please plesae

Best Regards,