[HELP] 3 GPU 280x Vapor-X on Motherboard Gygabite GA-990FXA-UD5

[Italone100]

Hello, i have a litecoin rig with 2 GPU 280x Vapor-X directly attached to the motherboard
yesterday I decided to connect a third GPU (280x Vapor-x) with a riser 1x-16x but i have the big problems!!!!!
the system does not boot
this is the video for the error on Ubuntu  http://videobam.com/kcHJr
thank you for help

[Italone100]

now this error
amd-vi completion-wait loop timed out
amd-vi completion-wait loop timed out
amd-vi completion-wait loop timed out
amd-vi completion-wait loop timed out
amd-vi completion-wait loop timed out
amd-vi completion-wait loop timed out
 

 

[crazyates]

now this error
amd-vi completion-wait loop timed out
amd-vi completion-wait loop timed out
amd-vi completion-wait loop timed out
amd-vi completion-wait loop timed out
amd-vi completion-wait loop timed out
amd-vi completion-wait loop timed out

Ya I get a bunch of those error while booting up our rigs. I think it's a BIOS thing. Running Ubuntu and Xubuntu 13.10, with different drivers (13.11b9.4, 13.12, and 13.11b9.5), and it shows up on all of them. They all use a Gigabyte GA-970A-D3P board. Doesn't stop them from hashing, tho. Don't think it's anything to worry about.

[Italone100]

but the system not start!
why?  I'm desperate
see the video of the error
http://videobam.com/kcHJr

[danilom]

try this:

Enter BIOS and set IOMMU off