The CX series is for factory OEM computers. I do not understand why they are sold to consumers, except to make profit on uneducated buyers. If you are going to build a low demanding computer, for surfing the internet or listen to recorded music, for example, the CX will work - as long as low power, low demanding hardware is in the computer.
Most OEMs, if you want to upgrade your CPU and video card you need to get a better power supply, I have been down that road with people too often.
For most people visiting this forum stay away from the CX, and lower quality PSUs, and there are some.