I'm upgrading an old PC's power supply so I can install a low end graphics card. I found one by High Power that's cheap and should work, but I know nothing of the brand. I researched it some and found they are made by Sirtec which also makes for some other brands, but that's all I could really find. All I really want to know is how reliable are they? Will I have to replace it in a month with something else or will it last a couple years(which is easily the life left on the system I'm upgrading).