My mobo detect only 3 gpu. I tryed all the speps here and cant see the 4 gpu. Device manager just dont show 4th gpu. Have win 10 pro 64bit, amd 17.6.2 drivers.
Any more ideas?
If in the device manager, you should check every section, then if I saw something like VGA, right click on it and update driver.
No, there is no new device in device manager.
But i found the problem, the ATX PSU is defective. I use server PSU and ATX PSU. But the atx gone. There are some suggestions the problem was i didnt ground psu together with same ground cable. But dont know how to ground them? Just to connect both black wires from both PSUs?