With the coming of the GTX Titan derivation named GTX 780, we have very good performances available at a lower price point. Gigabyte is one of the companies which offer a highly overclocked variant and a custom, compact cooling system which is enough silent when the card is placed in a well ventilated computer case.
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