Corsair Vengeance LP DDR3 memory is equipped with Low Profile heat spreaders which have a reduced height of 1.03" (26.25mm) compared to normal Vengeance. They're designed for high-performance systems with extra-large CPU coolers, small form factor system builds, or any other space-constrained application where standard Vengeance memory might not fit.
You can find this module under code name CML8GX3M2A1600C9B. Letter B at the end is for the color name (other possibilities are Special Edition Arctic White and Jet Black. It is designed to operate at 1.5V. The Special Edition Arctic White models operate at the ultra-low voltage of 1.35V.
Each module is flashed with SPD that provides basic information. Intel Extreme Memory Profile (XMP) is recognized by both the BIOS and CPU-Z. If you notice that the memory is running slower and you're not the overclocking type, just enable XMP in BIOS and it will automatically select the right settings.