When it comes to PSUs, for years now the ATX unit has taken centre stage with little thought going into producing a different form factor. However, Antec have changed all this and decided that it is time for a revamp. Their new form factor, christened the CPX, is a lot bigger so as to allow more room for the guts and allow a less restrictive airflow. Electrically, it's just an ATX power supply but unfortunately the size means that a limited selection of cases can take the unit -- unless of course you're into modding. Antec clearly hope the new form factor catches on and their first model is the CP-850, but is all the hype really justified? Let's have a look...