How SRX5k max.throughput is calculated

Dear All,

I want to know how to calculate the maximum throughput for SRX5600 & SRX5800 series , I think it depends on number of SPCs , so how much Classis SPC and 2nd generation SPC can handle in Gbps ?

Thanks 

Regards,

Mostafa Elmokadem

JNCIP-SEC