Corsair's AX850 is an 80Plus Gold certified 850 watt power supply that aims to be the highest-quality model in its segment. It is fully modular and shows excellent performance characteristics in our demanding test suite. With a price of $180 it is not cheap but quality has its price.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips