I have to check that James what she dials in if only adjusting the LB. But on the Gene V, LB is THE setting to get most ram properly working at high speed. Regarding Pi and overal bandwith boost, consider it similar to the performance level we knew on X48. The tighter you can set it, the faster everything runs... Too tight and she won't post... Haven't been able to boot below 5 above +2400Mhz
ASUS did some awesome stuff with the presets for each IC type. However I can't use most of the tight presets with my rams. Think some presets on the Gene V are way to tight and/or most of my rams just suck butt But it's a good start to get things dialed in faster...