When we first reviewed TI's Dr. Thermal TI-V77 heatsink, it made a good impression on us. Though it was a relatively wide heatsink, it could have had some trouble mounting on a minority of motherboards. The TI-S8640N uses more height instead of width, but this issue could still come back. We'll put it up to not only the TI-V77, but also many of today's top dog heatsinks to see how it can stand up for itself.