In case not everyone already know this, FAH has had a GPU (Graphical Processing Unit, in short you're graphics card) client available for some time. the benefits of running the client on a GPU is that a GPU is designed to do massive parallel mathematical computations and it does it so much much faster than any x86 based CPU readily available. the speed benefits can be as much as 30x (!!) faster than any CPU in some cases and because of the major speed benefits the GPU's provide Stanford awards all WU's processed with a GPU client with 4x normal scores.
Read more here for a while now there has been a GPU client for FAH around but this one has been limited to run only on ATI 1900 graphics cards. Well now, or rather a few days ago, Stanford released a new GPU client designed to take advantage of all ATI x1600, x1800 and x1900 cards. While the 16xx and 18xx class GPU's cannot process WU's as fast as a 19xx card they do work much faster than a CPU.. [:D]
Get in Here (unfortunately it doesnt work on Windows Vista [b-(]) PS. to get a better understanding on the speedbenefits, have a look at this

as you can see, 161508 CPU's are used to provide a raw computing performance of 154 TFLOPS while
only 649 GPU's produce 38 TFLOPS!!