The Glacialtech Igloo 5751 PWM heatsink is identical to its namesake in all ways except for the fans. Where the original Igloo 5750 PWM cooler had a matched set of 20mm thick 92mm fans running in balance with respect to airflow, the Igloo 5751 PWM Frostytech is testing today approaches things differently.
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