I have the exactly same problem as ppv.
This even happens in cod2 as well.
The only hardware I havent tried to change in hopes of correcting the issue is the vga, mb and psu.
Tried every driver/bios/os combination there possibly is.
I was thinking about trying with a pci soundcard, but seeing as it didnt solve the problem for ppv, that wont be necessary.
Audio works perfectly in windows with no stutter whatsever, so I dont think its the audio codec.
ppv: what kind of p5k board do you have?
corsair hx 520 psu
xfx 8800 gts 320 mb
2 samsung 500 gb hdd
1 nec sata dvdr
3x 8cm fans
From what ive been told, my psu should be strong enough.