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I think it very unlikely that you have a problem with the firewire card or cable.
Firewire is a digital transfer medium, therefore quality is unlikely to be effected over the short distance of the cable, or by a cheaply made card. If you were getting constant dropouts and picture/sound freezing then it is possibly a hardware problem.
More likely is badly set up software. TMPGEnc has loads of different possible settings, as does most capture/editing software. Do a search on here for many threads on setting up TMPGEnc etc.
Mark.
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