Advice sought on audio stutter/DPC latency spikes

[Sergio the cat]

Hi (new here)

So I've recently completed a new build (Athlon X2 7850 / Gigabyte MA78GM-US2H / 2x2GB OCZ RAM / Sapphire Radeon 4670 / Asus Xonar DX) and everything's great part from this really annoying audio stutter.

It happens without any apparent pattern and is sometimes frequent, to the extent where listening to music isn't really practical. The DPC latency tool I downloaded shows that while my 'baseline' latency is around 100 microseconds, spikes as long as a few SECONDS are occurring concurrently with the stutter. In fact, even if i'm not playing audio, DPC Checker shows the odd spike appearing now and again.

I've tried systematically disabling virtually every device in Device Manager and to no effect. I've updated all of my drivers (sound/video/mouse/modem).The stuttering happens whether I'm using the Xonar or onboard sound, happens when wntivirus is uninstalled, all USB devices removed and if I'm doing nothing at all apart from playing music. I 've tried Winamp and Media Player and the problem persists.

So I'm all out of ideas. I just wondered whether this is anything anyone here has wrestled with in the past and if anyone's able to offer advice. ANY help would be rerally appreciated as this is driving me mad...

What's interesting is that I can stop a stutter "mid-stutter" by moving the mouse. I don't get the problem if I have a game running, presumably because I'm continually moving the mouse.

Thanks,

Sergio

 

[siumatfung]

erm lack of power from your motherboard? could u post a detailed spec pleaase

 

[Sergio the cat]

Mobo: Gigabyte MA78GM-US2H
CPU: AMD Athlon 64 X2 Dual Core 7850+ Black Edition 2.80GHz
RAM: OCZ Gold Edition 4GB (2x2GB) DDR2 PC2-8500C5
GPU: Sapphire ATI Radeon HD 4670 Ultimate "Passive" 512MB GDDR3
Sound card: Asus Xonar DX 7.1 PCI-Express Sound Card

The PSU is a cheap 500W no-name unit that I've carried over from a previous build. The nominal wattage is enough for my build (I've checked) but it's clearly possible that it's not giving me a stable supply.

Not that I would claim to be anything like an expert, but it didn't 'intuitively' seem likely that the PSU is the source of the issue - is this a common problem? (Genuine question).

Thanks for any advice you might be able to offer.