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I'm going to connect a 250W RMS subwoofer to a 150W into 4 ohms Amplifier. I want to connect the amplifier to a computer, so I will need another power supply to do that. - Should I look at the wattage of the amp or the subwoofer when buying a PSU? - Can I connect a let's say 300W PSU to a 150W...

Basically, I know that this APU is NOT soldered to the motherboard of this laptop (don't post that whole "laptop parts are soldered to the mobo, buy a desktop" BS, I have a custom gaming desktop and I know how to swap out the parts on both desktop and laptops). I would like to upgrade to an A8...