2 GPU, only one is working !

Godmaster

Hello guys I have a problem.
I have 2 Msi R9390 X the first one is plug on a riser usb3.0 and the second one is on the pci-16x port.
Windows has detect the 2 cards. but when i run ethminer only 1 card is working, the card who is on pci-E 16x, the card on usb riser doesnt work, I have a display port cable plug on the card plug in usb3.0 and my TV everything going well.

I have run :
ethminer.exe --farm-recheck 400 -G -F http://127.0.0.1:8080/rig --opencl-platform 1 --opencl-device 0 --cl-local-work 256 --cl-global-work 16384

I have also try 1 card alone with the riser usb on the first pci1x=> the GPU works
I try -t 2 with 2 cards, only 1 card works

Can i have one card on a usb 3.0 riser and 1 on pci-e with ethminer ? what can be the problem ?

Thanks for your help !

tflux99

just try ethminer.exe --farm-recheck 400 -G -F http://127.0.0.1:8080/rig otherwise there is some trouble with the mb or the raiser

Godmaster

I cant run ethminer without --opencl-platform 1 if not => error message
No GPU device with sufficient memory was found. Can't GPU mine. Remove the -G argument

hasher

What version of windows are you running? Have you installed AMD Crimson 15.12 drivers yet? Do that first, then try again.

muerethe

Take out the --opencl-device 0 it's not needed. Try
ethminer.exe --farm-recheck 200 -G --opencl-platform 1 -F http://127.0.0.1:8080/rig --cl-local-work 256 --cl-global-work 8192 -t 2

Godmaster

Yes i already have AMD Crimson 15.12 on windows 10,
ethminer.exe --farm-recheck 200 -G --opencl-platform 1 -F http://127.0.0.1:8080/rig --cl-local-work 256 --cl-global-work 8192 -t 2
only one GPU work i cant go up to 33mh/s :-(
Each card work alone

I must install AMD openCL SDK package: ?

Godmaster

I run ethminer -G --list-devices and only 1 gpu appears ! what can i do ?

muerethe

Your riser may be bad. If you just have the 1 riser then I would get 2 more and use risers on both cards. You have a hardware issue so it's just a process of elimination. Try a different pci port on your mb as well.