I have the 6200 T/C card and with some minor software adjustments you can run the game full detail(minus AA) with very little lag. The TC version can trick the pc into loading all its data into systym ram instead of its onboard memory. Effectively giving you 1/2 or 4 gig video memory. Depending on your system. (Minus O/S and any other crap loaded)
The only lag I really get is @ 200+ ships and then it only lags till the data is loaded once.