A psu wattage is just the max it can provide. A bigger PSU would not blow up any components, it will only have a larger POOL of juice for components to use. Your GPU only needs 110-130 watts under load. Depending on what else is in ur PC, you are probably fine with what you have. That being said, a crappy PSU, CAN blow up. Or just short out. In that case, the pc won't turn on and you will probably fry some components.