Yes. 512MB.Did you set the memory of the GPU to 512 MB in the BIOS?Thanks for the hint but I don't really think this has the same source for my problem as I didn't have de-synch of audio until now and stuttering is not occationally appearing. And it also appears in Windows Media Player.
Do you have a guess for another player to try the playback?
I don't want to give on that right now - but - if it is the integrated HD 3200 (+ maybe the HT) it should be solved with your card as it has its own memory, isn't it?
Also, already tried to increase GPU frequency to 700 MHz - no effect.
Is it save to increase/overclock the HT frequency (separate entry in my BIOS) to 1200 MHz?