I have a non branded 480w PSU and I'm going to order evga gtx 970 SSC and I'm afraid that it may blow up , written on my PSU the it has 82% efficiency and it has some labels +12=22a , +5v=30a , +3.3=16a , +5vsb=2.5a , -12v=0.5a that's everything written on my PSU , so should I buy a new one and...