I recently changed my PSU from a Zalman ZM1000-HP to a Corsair AX850. It's not that my PC is some beast demanding a lot of power, just that these were both highly rated as quiet power supplies.

I built a new rig a couple of weeks ago (specs below). The only real probelm I encountered was crackling/popping of the sound and some system hitches while in games or even while typing. But I've only ...