It's a 75w card and is within slot power requirements.  If it was power issue, the card's performance will drop but not crash.  It seems that you have a driver and settings issue.  Test with different graphics drivers and running Disk Cleanup to clear DirectX shader cache.
so i made a discussion before about  is my optiplex 390 mini tower can run r7 250 but plans was changed and i have got rx 460 but i can still get my money back it ran well but there is some crashes and driver timeouts ocurrs from time to time with no reason i just want to know if the card is too powerful for the pc ?
ASUS RX 460 OC .... can it run on my pc ?