DominobryaninphxI cannot find the tuner specs for the Samsung GX-SM530CF CableCARD Box, but it should work since it is so new.
http://www.amazon.com/Samsung-GX-SM530CF-Streaming-Player-Built-In/dp/B00EYO241Q
I have in the past found this info. The Samsung box indeed does support 1GHz/H.264
We would also need to know if it supported Copy Protected content in H.264/MPEG4. The TiVo Premiere did not when Cox first introduced the Plus Pak HD. TiVo had to update the software to accommodate that.