Hmm interesting, back when I had it, I couldn't average more than 20kbyte/s on single threads. However there were times I could easily get 2mbyte/sec on it when I originally got it, but from there on it just went downwards slower till 20kbyte/sec at which point I left it. That was with 56k dialup as upload still. All single thread downloads. I wasn't interested in p2p back then as upload was a killer on downloads as you can imagine why...
I still even have the dvb card, also a Pent@Value DVB card. Massive PCI card.
But what you have, sounds like almost uncapped solution at alright speeds...