The RS2League has done an indepth analysis of the Standard GamePort, Thrustmaster ACM GameCard, CH Products Auto3 Gamecard, and PDPI L4 GameCard.
They aren't reviews... they are tech papers on how they work, put in Layman's Terms.
What does this have to do with FrameRates, etc.
I HIGHLY suggest you read the papers if you don't know the answer to that... It could save you some HAIR PULLING in the future... I guarantee it.
The URL is: http://www.racesimcentral.net/
I suggest you read all of them.... but the REALLY important one is the "Standard GamePort" Paper. You'll see why...
Cheers,
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Jason Murray (Shumi)
Eisen Racing
RS2League Coordinator: http://www.racesimcentral.net/