I realize the OLED Series 3 needs two cablecards to record two channels at the same time, I just don't understand what about the hardware is it that makes this so. I'm sure others might want to know the reason as well. I never questioned this before until I heard that the new Tivo Elite only needs one cablecard and can record up to 4 channels at the same time. And the TivoHD only needs one cablecard to record two channels. I know it's a hardware thing, but what specifically in the hardware is the reason? And what is the limit to how many channels a cablecard can decode to record, or is there one?