This time, in our test lab arrived Sapphire HD 5750 graphics card with custom cooling system already seen on several Vapor-X models. This cooling system is based on Vapor Chamber Technology that, basically, functions similar to heat pipe cooling systems. It consists of one “large” chamber with coolant liquid that evaporates when heated by, in this case, GPU, which is in direct contact with bottom chamber surface. The rest of the cooling system is consisted of slim metal fins and one fan. This solution is much better solution than referent ATI solution used on referent models. Vapor-X on Sapphire HD 5750 was almost silent during all our tests and never got over 55 degrees Celsius, which is great result. In closed enclosures, this temperature can go up to 65 degrees Celsius, but even that is great result…