Thanks for the link and the clue. In a post I found they say video controllers identify the chip inside CE310B as being 'Conexant Systems, Inc. CX23887/8'. I understand it’s either CX23887 or CX23888. The link does not show CX23887 details however I found it (CX23887-14Z) is definitely 10-bit as well. Why should then Avermedia deny in the datasheet I attached that it has a better colour depth chip in its CE310B card? Bizarre.