Pyrexia is triggered by the hypothalamus, a small gland located in the brain and the body's internal thermostat that is activated by pyrogens in the bloodstream. Pyrogens are released into the bloodstream from injured body tissues or from the presence of disease cuasing microorganisms.
The refresh rate your screen is running at will be listed in a little window within a drop down list eg, 60 Hertz, 70 Hertz, 72 Hertz and on uop depending on what your monitor can handle.
Refresh rate is most noticeable a RR of 60Mhz looks like *bip*. your eyes will not like it,but 60fps is ok. But fps in games are not just eye candy,it has impact on gameplay.25fps is not a playable speed it may fool you eyes in movies but it will not do in games.