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I had the same thought! i think it can run 4 cards max if im not wrong, try with 3 cards like @timmyit said if the error stay the same check your risers.

Thanks for the suggestion! But as a newbie I think I messed up somewhere in the system with all those drivers and stuff ..

Well it works with 2, code 12 on 3, and one does't even detect it. I will try to update the bios.. but I heard that there are some settings in the bios but I still don't know what exactly to change. Also I'm not sure witch driver to use .. Thanks for the help!

Ah i see, well i'll give you some good youtubers links i hope you find the solution there and try to look at Bitcointalk forum maybe you'll find out how to fix that problem!

https://www.youtube.com/channel/UCGQ3XHtsH8Q9iQr9bFbgfDA https://www.youtube.com/channel/UCkYCnjVcFJDN6Cp_uP0pv_A

Thank you for the links! I searched but I didn't find anything related with the system setup for mining also didn't find the drivers that I should use. Also I don't know how to setup the bios in the motherboard for mining... Thank you again :)