The first comparison of the two phase change cooling units of the superlative, nVentiv's Mach II GT and Asetek's Vapochill LS. A beautiful and very detailed review from Bowman1964. Results: The Mach II GT is clearly the better unit with lower temperatures up to a heat output of 150 Watts, but the Vapochill LS holds its temperature up to 240 Watts. Everybody who still wants a Mach II GT should hurry up, because it looks like nVentiv is bankrupt. Nobody knows how the support will continue, but the HVAC technician of your choice can easily help you fix all issues.