I am trying to run it in cubase, when i select the rme fireface asio drivers, the perfomance is really bad, like red and clipping and sounds distoreted, when i choose the asio directx full duplex driver, which i think is asio4all, its fine and perfonmance is very good, but oviously i think the rme driver is better, i just dont know why it isnt working, my soundcard is running in bus powered mode, does this have an effect on perfomance? I dont have a power supply but could potentially buy one if so.

Thank you