Mobo with 4 gpus help? Will tip

[note235]

I'll tip the person who solves this problem

I have one rig with a

gigabyte ud5 x79
evga 1300 watt psu
3x radeon 290

and I have one radeon 270x I want to use.

Currently I am using the usb3 pcie x1 risers for 2 of the 3 radeons and one radeon is in the pcie x16.
If I connect the radeon 270x via another pcie x1 usb3 riser the pc turns on but nothing shows up on the screen

[PeerMedia]

I'll tip the person who solves this problem

I have one rig with a

gigabyte ud5 x79
evga 1300 watt psu
3x radeon 290

and I have one radeon 270x I want to use.

Currently I am using the usb3 pcie x1 risers for 2 of the 3 radeons and one radeon is in the pcie x16.
If I connect the radeon 270x via another pcie x1 usb3 riser the pc turns on but nothing shows up on the screen

I'm guessing you're using a linux based OS? I frequently get no video feed when I go from 1 GPU to 2+, BAMT, Xubuntu, etc. I went nuts trying to figure out why and simply gave up. I ended up installing SSH/RDC and after 1 GPU, I connect to the rig remotely to do everything else. Not sure why this happens, but every rig I've setup had the same issue.

[note235]

I'll tip the person who solves this problem

I have one rig with a

gigabyte ud5 x79
evga 1300 watt psu
3x radeon 290

and I have one radeon 270x I want to use.

Currently I am using the usb3 pcie x1 risers for 2 of the 3 radeons and one radeon is in the pcie x16.
If I connect the radeon 270x via another pcie x1 usb3 riser the pc turns on but nothing shows up on the screen

I'm guessing you're using a linux based OS? I frequently get no video feed when I go from 1 GPU to 2+, BAMT, Xubuntu, etc. I went nuts trying to figure out why and simply gave up. I ended up installing SSH/RDC and after 1 GPU, I connect to the rig remotely to do everything else. Not sure why this happens, but every rig I've setup had the same issue.

windows 8.1 x64

[PeerMedia]

Can you tell if you're making it into windows (or if the rig isn't booting past the BIOS)? If its the latter, I'm guessing a riser or slot isn't working. Are any of the risers powered? You might be overloading the mobo if they're unpowered.

[note235]

all the risers are powered

i can't tell because nothing posts to the screen

[SheepOnDrugs]

Can you SSH into the machine or ping it?

[PeerMedia]

Can you hear the HD spinning for 1-2 minutes as it normally does to boot into Windows? How about RDC/VNC once its booted (assuming it does)?

[note235]

Can you hear the HD spinning for 1-2 minutes as it normally does to boot into Windows? How about RDC/VNC once its booted (assuming it does)?

im going to try and rd into it soon
i'll check on the hdd

[note235]

couldn't rd into it
will wait until new risers come

[note235]

risers came
installed all 4 cards (3x 290) and 1x radeon 270x

powered up and I can log in but none will mine
removed the 4th card and all works well