Onkyo 805 internal amps vs. Quad 405

I picked up some brand new Elipson Legacy 3210’s a little while ago for my small secondary 2.1 setup. Right now I’m powering it with my Onkyo 805 which is highly regarded for its amp portion. Would a Quad 405 power amp be an upgrade? I have one sitting downstairs and I’m curious before ripping stuff apart for an AB comparison.

If the 405 is considerably better are there any upgrades/updates I can do as a very inexperienced DIYer with amps?