On the heatsink test bench today is Xigmatek's Prime SD1484 heatsink which features a few notable changes to the standard, stock tower heatsink Xigmatek offers. For starters, the edges of the aluminum fins are squished slightly to form a blunt knife edge to reduce air flow resistance - Gigabyte tried this in 2006 with good results - Xigmatek have applied a 4mm chamfer to both edges of the fins.



Link: Frostytech