ok, here the values from my ST-Audio DSP2000 C-Port (bought in 2003 !!)
http://www.st-audio.de/products/dsp2000.html
Driver: dsp24ewdm 8.4.1021
LTU results(in msec) @44.1khz all stable
48: 2.20 ms
64: 2:95 ms
128: 5.85 ms
256: 11.63 ms
Win XP SP3 Dux's version
Intel(R) Core(TM)2 Duo CPU E4400 @ 2.00GHz
Gigabyte GA-P35-DS3
4GB Kingston 2G-UDIMM
cheers, hb