I've just purchased this board after i saw the favorable, Phoronix and Anandtech, reviews, but now i'm faced with sound problems (choppy sound, fading volume) whenever i run some apps like unrar-ing some files, compiling kernel, copying some files on the hard drive.

looks like the problem might be ALSA related ( as seen here , there and over here )

any ideas? already tried the buggy_irq option but it just fails

dmesg (not sure if this is the reason) says:
[4294677.882000] ACPI: PCI Interrupt 0000:00:08.0[A] -> GSI 18 (level, low) -> IRQ 24
[4294678.907000] AC'97 1 does not respond - RESET
[4294678.922000] AC'97 1 access is not valid [0xffffffff], removing mixer.
[4294678.936000] Unable to initialize codec #1
[4294678.950000] applying quirk type buggy_irq failed (-22)
[4294679.016000] intel8x0_measure_ac97_clock: measured 51191 usecs
[4294679.030000] intel8x0: clocking to 48000