I tried Google, but couldn't find any information about the difference between the Samsung SH-B123L and the Samsung SH-B123L/RSBP Blue-ray Combo Drive besides a couple dollar difference.
I see only the name difference, a couple dollars in cost, and on newegg I see no mention of cache about the rsbp, but have seen it mentioned on other sites. I'm sure it is minor, like RSBP just means something that comes inside the box, but this drive is the only computer related thing that says RSBP.