Today NVIDIA announced their new GeForce GTX 550 Ti Series. ZOTAC's AMP! Edition comes with increased clocks out of the box. It is also the only card that features a full size HDMI output and a full size DisplayPort output in addition to two dual-link DVI ports which make the AMP! Edition the connectivity champ.
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