oh my !

In what way does this PSU make your system runs better? This doesn't make any sense.

I don't know your system, so I can't answer if you stress the PSU too much. But hey if it runs 'better' you probably don't.
For your information the need for massive power supplies is IMO greatly exadurated. I have a Pentium 4 2.26 GHz, GForce 3 graphics card, Soundblaster 5.1 live sound card, 2 HD in RAID, 2 CD/DVD drives. I have measured the power consumption of this setup and have <i>never</i> exceeded 200 W. Not even when running CPU and graphics demanding games. This is measured on the mains. So considering the efficiency of the PSU the actual power consumpiton of the PC is probably less than 180W.
So who needs more than a 350W PSU?

<i><b>Engineering is the fine art of making what you want from things you can get</b></i>

I used the term "better" in the sense that my voltages are down significantly. I don't know about actually performance increase but am amazed that a brand name 350 watt PS does a better job then an generic 550.

Supporting AMD with your breakable stuff.