Hello, I’ve recently bought the asus gtx 560 ti and when I put the GPU in the motherboard it beeps 1 long time and the screen continues to be black... I have an 450w psu, which has +12V 20A and the mobo is ga-ep31-ds3l, thank you for your time.
Yes, it is safe. The PSU won't give the motherboard more power than it needs. Just make sure you buy one with enough power (watts) to handle everything in your system.