The NF4 was perhaps their last best chipset. After that they started to have many issues. Many ran hotter then the AMD/Intel chipsets. The 6xx series had an OCing bug that caused data corruption in your harddrive if you OC'd it. In addition while the P35 chipset would support 45nm Quads, the 6xxx doesn't. You need a 7xx chipset to do that. Features wise they are good chipsets, but there always seems to be something wrong with the total package.