dhornbrook :
I see people mention Corsair, but I was under the understanding that they are all made by Asetek. Which makes these water coolers for the companies. Any company that tries to come up with their own design, gets taken to court by this company.
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There are about 6 manufactures on the market producing AIO liquid cooling.
Asetek is the major one and most AIO are rebranded models with just little tweaks from companies. They usually have the round waterblock.
CoolIT is second in line as they created all of the square waterblock Corsair AIO coolers. Corsair rebrands CoolIT and Asetek AIO units.
Zalman is not new to the game but their latest Reserator AIO units which they manufactured have not made headlines. They also sold rebranded Asetek units under their LQ line of AIOs.
Swifteck also makes AIO but was sued by Asetek so they could not sell their units state side but are available outside the US. CoolerMaster brought licensing rights to their H220 and H320 units and rebranded them, CM now sells the units as their Glacier series.
CoolerMaster have their own line of coolers which are not rebranded such as their Esberg, Nepton and Seidon line of coolers.
Antec who also sold rebranded Asetek units now have their own units out under their Kuheler line,
Silverstone just came into the market creating their own unit with better radiator tech with the TD01 and TD02. Enermax brought licensing rights and rebranded the units as their Liqtech line of AIO.
Artic, Thermaltake and NZXT units are all rebranded Asetek AIO units.