Has anyone received there order?
Yeah thats just about it, although undervolting actually helps the cpu achieve a higher sustained boost as it will able to sit below its thermal throttle temp as obviously less volts=less heat but this is also dependant on cpu binning ie if you are lucky and have a good cpu that can undervolt without issue. I guess also you might get 1% better battery life too. Also fan curve can work both ways quieter one for people who just want browse the web in silence or gamers who want an aggressive fan so that they get max performance in games with less thermal throttling
Just read up on them both and get it! Undervolting is supposed to stop high power consumption but the drawback is therefore you don't get high performance as it's throttled. Guess your bios change bypasses this Custom fan curve is just a custom setting for the fan speed/emp balance. Probably to make it quieter. Still have no idea which bios you would choose and why but at least I learnt something!
Haha. No offence but if you don't understand what I just said then you probably shouldn't be messing with downgrading bios' and undervolting. To be honest there's not any real need to do anything out of the box. Some techies just like tweaking stuff.