http://valinet6l6tq6d5yohaa6gdsf2ho4qcqcxyj2nahp5kd4z7nsa6ycdqd.onion/2015/09/22/ThinkPad-W540-review.html
It also lets you toggle the fan up to maximum, via a feature called Lenovo Turbo Boost+ (not to be confused with Intel Turbo Boost), so you can benefit of maximum performance out of the machine. (Note that this is only available in Basic mode, while the rest is only available in Advanced mode) Although it gets quite noisy, and personally I don’t know why it is necessary at all, as the system can kick the fans on its own if needed, and otherwise keeps a quite profile.