The SRX5K-SPC3 Services Processing Card (SPC) contains two Services Processing Units (SPUs) with 128GB of memory per SPU, that provide the processing power to run integrated services such as firewall, IPsec, and IDP. All traffic traversing the services gateway is passed to an SPU to have services processing applied to it. Traffic is intelligently distributed by I/O cards (IOCs) to SPUs for services processing.