Most FortiGate models contain CP9 Security Processing Unit (SPU) Content Processors (CPs) that accelerate many common resource intensive security related processes. CP9s work at the system level with tasks being offloaded to them as determined by the main CPU. Current FortiGate units include CP9, CP9Lite, and CP9XLite processors. Capabilities of the CPs vary by model. Older CP versions include the CP4, CP5, CP6, and CP8.