Clicking and poping noise on stereo when output to directsound / waveout!

Onboard sound, only digital output (SPDIF) is used!
No problem if going through WASAPI, AC3 and DTS are fine too.

But if I play stereo audio (even fixed at 16bit) through directsound or waveout, random noises are poping out from time to time. Audio driver and MB bios updated!

CPU: i7-920
Motherboard: GA-EX58-UD4P
Win7 x64 Ent.

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