Am I trippin 300 watts rms subs

I have 2-12 inch Memphis Audio PRX124 in a dual 12 inch Q bomb box. Run by a SRX 500.1D Memphis Audio amp and they hit hard, vibrate the whole car and all. Everyone that's heard says they bump good. I keep hearing people say you need 1000 watts for amps and subs to hit really hard. Is 1000 watts really that much harder/ louder?