The new ZM600-RS is a upgrade of the older ST model Zalman produced some time ago. The differences are mostly functional and in an improvement. The RS in the name comes from resonant switching which is a series of magnetic coils that reduces electromagnetic interference when load is applied. This also means an increase in efficiency and an upgrade to an 80Plus Bronze certification. This new power supply is just another reason why Zalman is at the top of the industry.



Link: Pro-Clockers