The PS3 slim also runs quieter and is cooler than previous models due to its 45 nm Cell. The PS3 Slim no longer has the "main power" switch (similar to PlayStation 2 slim), like the previous PS3 models, which was located at the back of the console.[36] It was officially released on September 1, 2009 in North America and Europe and on September 3, 2009 in Japan, Australia and New Zealand.[36][40][41]