I just bought a used Aurora R9 and I'm kind of new to Alienware. I made some minor upgrades, 32GB Ram and I'm swapping out the fan with ml120 and a h60 cooler. My question is how do I know the PSU size on my model? From what I understand they come in two different sizes. I don't know if there is a distinct way to tell the difference. My model has a 9700, a 2070 super. Any import would be awesome. Thank you so much