Quote from: Pompobit on January 11, 2014, 10:56:23 PM

Thank you for the help,
but I figured today myself that the issue was due to faulty risers also in my case...

I bought 4 powered 1x to 16x cables and two of them don't work properly... Plugging 2 gpus directly on the 16x slots and the remaining two with the working risers did the trick and now windows 7 detects all gpus correctly.

Seems a lot of risers cables sold nowadays are of poor quality and many people reports problems.

If can I say something about your rig's instability, could be due to lack of power, maybe your psu is not enough for 4 gpus? You should have at least a 1200w gold rated psu, with a 1250-1300w gold would be safer.

Btw thank you again for your response

Yeah, I suppose the demand is so big that they make them in a haste and don't bother with quality control...

As for the instability, I am not sure about the lack of power as I have 2x 850W 82% efficiency PSU... two cards on each PSU. But I may try to add a third one, as it seems that one PSU runs hotter than the other.

I installed the latest AMD drivers (13.12), and it seemed to have resolved the problem... until this morning. It was hashing for 7 hours straight then started rebooting every now and then (less than an hour each time)

Quote from: ihopeigetrichpls on January 12, 2014, 12:52:27 AM

Quote from: Pompobit on January 11, 2014, 10:56:23 PM

Thank you for the help,
but I figured today myself that the issue was due to faulty risers also in my case...

I bought 4 powered 1x to 16x cables and two of them don't work properly... Plugging 2 gpus directly on the 16x slots and the remaining two with the working risers did the trick and now windows 7 detects all gpus correctly.

Seems a lot of risers cables sold nowadays are of poor quality and many people reports problems.

If can I say something about your rig's instability, could be due to lack of power, maybe your psu is not enough for 4 gpus? You should have at least a 1200w gold rated psu, with a 1250-1300w gold would be safer.

Btw thank you again for your response

hi where did you buy the working risers?

so others can make sure to stay away from the bad ones

I got mine on ebay.

But with all the issues with poor quality risers, I am more than willing to pay for a premium if a big and reliable company would sell those at their standard quality.