On Sam460ex using pciex1 CMI8738 with AmigaOS 4.1FE causes frequent audio and video freezes during video playback with random noise during freeze. after about 30 seconds normal playback returns until next freeze. Happens with Mplayer ,DVplayer and alpha Emotion player. Audio playback with out video works ok .Video card is Radeon HD7750 with RadeonHD 2.18 driver .
Audio and video playback work ok with a pciex1 Envy24HT or onboard sound .