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Types Of CX2388x Cards
There are many companies that used the CX2388x line of chips over the 2000s however with the advent of better hardware but massive old Stock chips today have been re-flowed and or taken from old stock to make the wildly available variants we have today.
As the RF capture input on S-Video is normally tied to the Luminance or Y Pin & Y GND it's recommended to get or make a breakout cable if you wish to use this input however be wary of cheep "for CCTV" sellers with badly wired cables.

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Conexant Chip: CX23883-39 PCIe 1x Bridge: ITE IT8893E 1228-FXA SC008B
The first "new variant" card that was found to have the ITE IT8893E 1228-FXA SC008B bridge chips that allowed for greater compatibility with older hardware, however in testing it was also found this card has the CX23883-39 chips due to a said version of the chip having less ability its thought that this factor is what has allowed these chips to provide a cleaner capture of RF signals from less hardware = less electrical self noise.
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Conexant Chip: CX23880-1 PCIe 1x Bridge:
The typical CX Blue card uses the CX23880-19 chips with the Asmedia PCI to PCIe bridge chipset, first found to use RF standard BNC connections and was considered the de-facto user convenient card but on some newer purchases, ITE bridges have been discovered.
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Conexant Chip: CX23880-19 PCIe 1x Bridge:
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These are more complicated due to mass obsolescence of PCI hardware however name brand ones are easy to document.