Sorry for the lack of info
Current system setup
- Motherboard GA-H77M-D3H bios version F4
- CPU i5 2500
- RAM 8G
- GPU Sapphire R5 200 series and bought Sapphire RX 580 nitrox+ to replace but undetected by Windows 10 64bit (even the old GPU has been removed)
- power supply 600w
Downloaded the latest driver from the web but after installation, it fails with error code saying hardware not found.
I have to ask... did you connect the power cables to the new gpu?
Only asking because your old one didn't use extra power.