What correlation between DAC video processor speed with video quality?

[DewAsmara]

I have learn,
that the more speedy video DAC processor then the more higher pixel rate that can show, like 216 up DAC speed can do 1080p upscaler or pixel show. But at what cost? Like Toshiba XE-1 HDDVD player run at 297 DAC can show HD material at 1080p and Denon 1930 at 216 can show 1080p upscaler. But also show the more deep processor bit so video quality will improve much better like Denon 1930 using 11 bit and Denon 3930 using 14 bit. It is much confusing, especially if want to buy new DVD or HD player.

[DewAsmara]

Not sure this correct or not,
My friend told me that for better pixel rate go for faster Video DAC Processor and for deep sharp image then look for higher bit processor. This at least make some clear understanding, so if Higher DAC combine with high bit processor it will show good quality image (at least theoritically). So therefore Toshiba XE1 HD DVD player will give superb image in both HD DVD and SD DVD at lower cost compare to Denon 2930. I wonder if any Multimedia HD media DVD player have this kind of spec, faster dac with high bit processor.