Its used for encoder, not for miner. Proves that bminer is more memory intensive than others. In most cases the Pill can boost it more than with others.
Your test is incompatible with reality, but in reality the bminer loses to the gminer and nbminer
Here are some reality tests:
MSI Armor GTX 1070 - core +100, mem +900(+450 windows), PL: 130W
bminer: Hash - 5.52 G/s, Fidelity - 1.973
nbminer: Hash - 1: 5.23 g/s , Fidelity - 1: 2.356
gminer: Hash - GPU1 5.21 G/s , Fidelity - GPU1 1.773
I will repeat again, bminer is tolerant to memory optimizations while other miners seem more compute bound.