It is a decent mid-range card. Not the top, not the bottom. Your Power Supply is very important, 500W does not tell us enough the brand is the most important, sometimes the model. Especially when it comes to "stability". I don't know much about the power system in cypress but the power supply takes you local power a feeds it to your sensitive computer electronics. Not like light bulb or hair dryer which can flicker and be ok.
I have a SL-500a powersupply