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RightMark Audio Analyzer loopback quality - 24-bit/192kHz
Our second-to-last RMAA test cranks the sampling rate up to 192kHz. The Xonar DGX tops out at 96kHz, so it has to sit on the sidelines.

  RightMark Audio Analyzer loopback quality - 24-bit/192kHz
  Frequency response Noise level Dynamic range THD THD + Noise IMD + Noise Stereo Crosstalk IMD at 10kHz Overall score
Realtek ALC898 5 5 5 5 3 5 6 5 5
Xonar DX 6 6 6 6 6 6 6 6 5
Xonar DSX 5 6 6 6 4 6 6 6 5

Ignore the overall score and focus on the rest of the numbers. The Xonar DX has a slight advantage over the DSX in a few tests, and both outscore the Realtek audio in the majority.

The graphs below bear out those results. The ALC898 repeats its early exit in the frequency response plot, and its high noise and distortion levels persist. Overall, the Xonar DSX has more distortion and noise than the DX, but neither jumps around like the Realtek codec.

Frequency response

Noise level

Dynamic range

Total harmonic distortion + noise

Intermodulation distortion

Stereo crosstalk

Signal quality under load
Not content to go overboard with four sets of RMAA results, we added a fifth. For this final round, we tested each solution's loopback signal quality under a heavy system load consisting of AIDA64's CPU stress test, the Unigine Heaven graphics benchmark, and a file transfer from a SATA SSD to another solid-state drive attached to one of the motherboard's USB 3.0 ports. We've seen much lesser loads taint the output quality of older integrated audio solutions, and we were curious about what would happen to our contenders with the system pushed to its limits.

We ran our load test on each solution at its highest quality setting. The Xonar DGX used 24-bit/96kHz audio, while the others were set to 192kHz at the same resolution.

  RightMark Audio Analyzer loopback quality - Load
  Frequency response Noise level Dynamic range THD THD + Noise IMD + Noise Stereo Crosstalk IMD at 10kHz Overall score
Realtek ALC898 5 6 6 5 4 5 6 5 5
Xonar DX 6 6 6 6 5 6 6 6 5
Xonar DGX 5 6 6 6 4 6 6 6 5
Xonar DSX 5 6 6 6 4 6 6 6 5

I had high hopes for this test, but it didn't end up illustrating much. For the most part, the individual scores were no different than the results of tests we conducted with nothing else going on in the background. In some cases, the load results generated slightly higher scores. We may have to try this test with some cheaper motherboards. Clearly, the audio implementation on our high-end Asus motherboard is well-insulated from system loads.

RMAA won't plot results with different sampling rates together, so we're going to skip the extra graphs.