Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
The XP-90 was released approximately a year ago and made quite a splash in the market. Lightweight, excellent performance and a low price made it very difficult for other competitors. The XP-90C came on the scene many months later by high demand, which is really nothing more than the XP-90, except for the fact that the XP-90C is made totally of copper. The only copper part of the XP-90 is the base of the heat-sink, which also explains why the weight of the XP-90C is almost double the weight of the XP-90!
The performance of both heat-sinks can be considered outstanding. Both heat-sinks are able to hold the CPU at very low temperatures, even at overclocked settings.