Importance of source quality with asynch USB DAC?


I have never tried computer audio and I'm considering either a great DAC with mediocre synchr. USB in, such as Bel Canto DAC3, or an asynchr. USB DAC such as Ayre or Wavelength. The advantage of the former being I can use my CD player as source until I can buy a new computer, and the advantage of the latter being I can simplify the system.

So my question is how important is the quality of the source computer with an Ayre QB-9 or Wavelength. My current laptop is a Dell Latitude 420 (I believe), which is 4 years old. Alternatively I could use an even older Sony Vaio PC, but that's old. I know people rave about Mac Mini + an asynch USB DAC...that would be my goal down the road, but how would it sound in the meantime, compared to a Bel Canto DAC3 fed thru S/PDIF from a Rotel CD player as transport?

Thank you!
lewinskih01
High power cpus usually do get a bad name in some circles. While it doesn't take a ton of cpu to playback 192kHz material for example, system latency may be an issue, and with a more powerful cpu maybe their are less DPCs. I have noted how driver problems caused high system latency using J. River when trying WASAPI vs. Lynx ASIO using their awesome library server over LAN. ASIO would cause high system latency and strain my low power ION board's gpu when minimizing and maxing the 1920x1080 screen - causing one click. WASAPI with same material, would result in super low system latency and no clicks or pops. It realy is amazing how well implemented WASAPI seems to be, for the most part.

This was with a dedicated gigabit wired lan connection, not wireless (which exhibited the same behavior but MUCH worse). There is this big anti-buffer, anti-power commmunity and I think it may be like Mike said, that with more crunching power you can actual better lock down everything Windows is doing. No one posts ABX tests, but hey maybe the difference when they add a linear is "night & day".

I think it's a balancing act which must be struck because at some point you are pushing the PC, such as streaming high bitrate video (mkv at 100000kbps or 192kHz audio at 3-5000kbps), closer to the edge of data shortfalls which results in buffer overruns that a DAC can't always handle (loss of sync or white noise_ because WASAPI lets the hardware and driver decide what to do with such data shortfalls (as opposed to ASIO).
Hi Mryan,

I've built a few servers as well, and similarly, one of my servers doesn't sound as good as the other two. I don't think the cause is specifically CPU power, as the one that doesn't sound very good is more powerful than one of the machines that sounds very good. Hence, I am interested to know what motherboards you are using in your various servers that both sound good and don't sound good.

The machine I built that does not sound quite as good uses the same style Seasonic power supply as in my other machine, an Asus P5W DH Deluxe motherboard, an Intel E6600 CPU and Corsair RAM; all reasonable quality stuff.

Alan
The systems I liked use Intel DH55TC mobos with I5 680 cpus. The system I have trouble with is an Asus P5QPL-AM with an Intel E5300. The Intel boxes carry 8GB and the Asus 4GB.