In any game that I play, the game itself plays perfectly, but any FMV that starts will just tank until it stops, where it goes back to normal. I'm not sure what else to put, it seems like a very strange issue.
EDIT: I'm running in Revision 5.0-4398 with an Intel i7-4790k @4.1ghz and an AMD RX 470 and haven't tweaked the video settings.

EDIT: I'm running in Revision 5.0-4398 with an Intel i7-4790k @4.1ghz and an AMD RX 470 and haven't tweaked the video settings.