OpenELEC hardware upgrade

I’m using raspberry pi boards as media center satelites to run openelec/kodi. Some features of this setup: installed directly behind the screen…essentially the hdmi port holds the board ethernet connection central mediadb => stop on device1, and continue on some other device feature I’ve hesitated to upgrade any of these devices: because they worked and i’ve read about rpi3 that it needs 3amps..but since i’ve needed an rpi board for the busyboard project; i’ve ordered one.