Currently have a gtx 670 with 2 6pin ports through 4 molex(2 molex per 6pin) port. Got a 1070 a few days ago and realized I didnt have an 8 pin. So I went ahead to a pc shop to get a molex 8pin and they said that would be a bad idea as my psu was too trash and I should be using a gold grade to power the 1070. So they recommended me to buy one of their gold grade psu's.What do you guy's think? should I upgrade my cooler master 600W silent pro modular 80+ bronze?