![]() ![]() ![]() ![]() and it has to pass through several layers before PCM samples arrives to the device. Of course there are several queues, it's asynchronous. and request the transfer via URB (kind of special message for the request) from OS USB stack. it needs to get samples from ASIO/Core Audio driver. Where still - compared to PCIe, the driver doesn't have "direct" access to hardware memory. But I don't think, it has potential to inherently cut down latency and required buffering for streaming of USB audio. This might do the trick, when we'd talk about some high speed concurrent streams or some real high bandwidth devices (storage). There are of course some advancements in the protocol, like full duplex lines and asynchronous signaling. I can't see anything in protocol or its handling by OS, which could really improve latency performance in this particular use case. you likely won't find any worthwhile difference. (which could be probably addressed also to heavy optimization in USB stack at OS).īut if you take just USB 2.0 and 3.0 interface with the same transfer type, buffering and hardware (eg. the former one can be more efficient, so it takes less cpu cycles. What I've found in my previous development tests. TAFKAT's latency performance thread can be found here: Audio Interface - Low Latency Performance Data BaseI already commented about that in the very thread.ĭevil is in the details and RME USB 3.0 at UFX+ or MADIFace XT performance is exceptional, however there's where all other thing aren't equal, because by default (you can override it) they also use different USB transfer type at USB 2 (isochronous like most of other USB audio interfaces) and 3.0 (bulk). ![]() You can see that RME USB3 driver performance nearly matches TB2/PCIe performance, whereas every RME USB2 device is still behind in terms of latency. With all other things being equal, the newest tests suggest yes. ![]()
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