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I'm not sure I understand you

*** I still prefer SATA as you can disable IDE. ***

Since SATA has higher bus latency than IDE why not disable SATA?

*** SATA latency has no impact ***

In that case, why worry about PCI bus usage at all?

I'm not sure why you would be worried about USB and Ethernet PCI usage (when these devices typically don't impact the PCI bus) but then say a device that has latency high enough to potentially cause audio/video stutter has "no impact"?

*** SATA RAID 0 would solve this. ***

I'm not quite sure how using RAID 0 can reduce the bus latency of a SATA chipset? Wouldn't it actually *increase* latency (because the chipset now needs to do more work for each I/O request)?

*** On toslink, yes DAC should do reclocking - I use AA Prestige SE ***

If the DAC is reclocking and resamping the SPDIF input, then why optimize the PC at all (since any jitter in the input signal to the AA will be discarded by it's resampling)?

Also, why upsample in Foobar using SRC? You'll end up triple filtering the audio (SRC upsampling, and another layer of resampling by the AA Prestige, followed by final filtering in the DAC itself). Each filter will add an additional set of artefacts to the signal.

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