Left 4 Dead 2 Demo (PC) Stuttering / Sound loop issue with Multicore rendering enabled.
Video showing sound loop / freeze issue, I'm sure Valve will fix it but for now it can make the demo a pain to play, Disabling Multicore rendering in game options fixes it but also cuts overall performance by 30-35 fps.
Win XP SP3 32-bit, AMD X2 4800+ dual core , 2GB ram , EVGA GTX 260 Superclocked edition, X-Fi audio, All in game graphic options at highest settings.
Sorry my camera only records at 320x240 resolution.
EDIT: This problem was greatly reduced for me in XP once Valve addressed the issue in the full version via patch, Also I haven't seen it occur at all since switching over to Windows 7 64-bit.