InsaneTek posted a review on the Gigabyte Geforce 6600 GT Silent-Pipe II GV-NX66T256DE

Although applied to only a mid-ranged video card, Gigabyte's implementation of their new Silent-Pipe II is excellent. The overclocking results do not seem to be held back in any way!

Gigabyte Geforce 6600 GT Silent-Pipe II GV-NX66T256DE Review