Research shows GPUs rendering complex passwords useless

A new study of password cracking by Vijay Devakumar has shown that modern graphics cards may have rendered even tough passwords easy to crack.

Tools such as IGHASHGPU can reduce the time taken to break an NTLM password used on Windows networks from a virtually impossible period to a realistic period. Using a strictly mid-range chip like the Radeon HD 5770, a very tough nine-character password can shrink from 43 years to 48 days; a five-character alphanumeric but random password can be broken in as little as 24 seconds.......

Source:
http://respectedadmins.com/blog/research-shows-gpus-rendering-complex-passwords-useless/