The new case that I got will only fit in a semi enclosed space in my desk, 2 enclosed sides. With my current system, it gets fairly warm. I'm looking for options to cool that space with small fans similar to case fans. I have some old power supplies that I heard can be set to on without being connected to a motherboard. Also heard an old at power supply with the on/off switch would work for it also. Any ideas to help me out here?