Does routing HDMI audio via graphics card, slow down graphics card ? Split graphics/audio via 2 HDMI ports ?

Some computer motherboards do not have HDMI output port.

HDMI output port is necessary to connect computer to Denon Receiver for top audio.

If computer/motherboard does not have HDMI output port, then HDMI output port of graphics card could be used to contact to Denon Receiver.

Some questions though: 

Does this slow down the graphics card ?

Also I assume that motherboard with HDMI outport can be used to connect to Denon Receiver while Graphics Card can be used to connect to monitor ?
(Even if two HDMI ports present, two can be used ? one for audio and one for graphics ?)

Can HDMI and Display port of motherboard be used at same time with just Ryzen 7000 integrated RNA2 graphics chip ? So without graphics card ?

Bye,
  Skybuck.