Almost all alternative coolers for graphics cards have one common drawback: they block at least one and in most cases – two PCI slots on the mainboard. At the same time, it is better to keep the third PC slot empty in order to ensure that there is proper airflow coming to the cooler fans. This way, you improve the graphics card cooling and lower the level of noise by losing two or even three PCI slots on your mainboard. As a result, very often the users have to give up the idea of replacing their reference VGA cooler with a more efficient and quieter alternative. The South Korean ZEROtherm Company decided to solve this issue once and for all and launched a new graphics card cooler called CoolMaxx 4000.