No you do not.
The standard Big Ben can lock to analog video. NTSC or PAL and all the usual sample rates and pull up/downs.
The X-Video option gives the following extra functionality.
- Ability to act as a video clock generator.
- Ability to act as video slave (like a standard Big Ben) but whereby the video outputs are genlocked (cleaned up/regenerated) versions. The X-Video card will maintain the color-phase and field information through “Genlocking”, while simultaneously stripping the original signal from its pixel information.