I recommend you get a better psu. First of all, a 300w might be a bit small for the setup you're running. You might want a 380w antec true power, or something comparable. Second of all, generics usually won't even run at the advertised spec. Occasionally you'll run across a decent one, but usually they have much less output than one from a quality brand such as antec or enermax. One way to determine if yours is any good would be to see how heavy it is. If it's a real lightweight, It's definitely not going to be good enough.