RV901H/921H/931H is upgraded from the 8th generation system RV801. Compared with RV801, RV901 has all functions
of RV801 and can replace RV801, besides, RV901 is added the following functionality:
1. support 12-bit HDMI colors input (required the 9th generation sending card)
2. using18-bit signal processor, maximum support 18-bit (260,000) gray (each of red, green and blue)
3. Single card maximum supports 1024X256 pixels, and 1024 grades single pixel chromaticity correction