Hi,
Bad choice for AMD mobos,
The manufactures Havent thought this through properly, they should have designed a mounting bracket with more options for exhaust discharge,
I would in your circumstances contact the manufacturer and ask them if they make a a different clamp assy to exhaust to the rear,
As you got it< I would exhaust towards the graphics card, and reverse any side panel fans to extraction,
Far better than shoving hot air into your PSU,
Others here may come up with another option,
regards