Both use a clip-on system similar for the HR-01 and they are light
weight. Unlike the HR-01 however they come with clips so you can
install a fan onto them. While the HR-01 was Thermalright's first tower
cooler, it didn't support a fan mount, the "Ultra-90" and "Ultra-120"
are designed for use with a fan and it will be interesting to see how
they will perform.. Head on to Madshrimps to learn more.