Cooler Master XG PLUS 850 Platinum Cooler Master Co. LTD.is a company that is well known for producing enthusiast computer cases and has been in business for almost 25 years. In addition to cases, Cooler Master has product lines for CPU and GPU heatsinks, case fans, various accessories, and power supplies. Cooler Master’s entry into the power supply market has been rather mixed with some good products and some that could use improvement.