Sony PCV-RZ56G Manual

Your computer may have one or more open expansion slots, depending on the model configuration. An expansion slot
enables you to install add-on cards to expand the functionality of your system. The length of the add-on card should not
exceed 9.05 inches. 

  

 Add-on card configuration varies by model. Some models, such as Configure-to-Order (CTO) systems, may contain

preinstalled add-on cards.