@Mooie_D: Sorry for stealing your topic, but I guess/hope it does answer your questions also...
Ok, thanks! Just to be sure: With my PCI soundcard I can only go to 64 Samples which crackles a bit so I raise it to 128 samples. With this setting in Cubase at 96kHz I get around 1.5ms of latency with no cracks/noise (just playing one instrument of course :-)). So with the 48 samplebuffer from the UCX, I should be able to match or have better latency, correct? And with the AIO possibly even a little more than my card and UCX (if the PC can handle it)?
The UCX seems perfect, but I don't want to have lower latency than now with my PCI card. If not possible with the UCX, I'd go for the AIO...