USB 2.0 can be found on Wintel machines since 2002, but the first generations of USB controllers did not work quite as well as required for realtime audio. Although PCs from around 2003 (e.g. Intel 875 with P4 CPU) work well with the Fireface UC in principle, a simple stereo playback already causes a CPU load around 30%. Latencies below 256 samples are not always click-free even with small applications. Close examination revealed that this CPU load is in fact a hidden DPC latency. Apparently, the interface chip works inefficiently, and causes wait states for the CPU.
This behaviour occurs regardless of the driver and operating system. Intel seem to have identified the problem with the ICH7. 依你說的Intel的穩定性也不怎麼樣,容易會有相容性問題,可見Intel也不是萬無一失的不是嗎?你到底有看懂嗎?還是我理解能力不好?
Older AMD and ATI based PCs frequently have disastrous USB interfaces, which prove to be totally incompatible with the Fireface UC. 到底是多舊的會有問題也沒說?