Hitron CODA-4582 can I literally just use this modem and its ports and obtain gigabit speeds or should I build a router .

Subject says it all .... Hitron CODA-4582 can I literally just use this modem and its ports and obtain gigabit speeds ? 

I get the purpose and the benefits of the utm apps including security but . speed alone not thinking security etc can I literally just use the hardware my isp has provided and get my 940 or so speed that i've confirmed outside of my lan across all ports using there hardware or does this hardware only ensure this speed on the wan side ? Example just using this hardware and connecting a few pc's using the hardware dhcp will i still obtain wan speed or do I in fact need to build my own capable router and user a proper switch on the lan side to maintain the wan speeds I know  I am already getting ? 

I have a super micro d525 board from a while ago but am realizing this is a paper weight with sophos and gigabit and that at least an i3 with single core clock speeds close to 4 ghz is necessary for all features and 0 hiccups as well as dedicated intel nics . 

Thank you 

-Nick