If your computer recognizes the kind of monitor you have, it should give you an idea what the max refresh rate is for that particular monitor.
My Viewsonic A19F+ was SWEEEET at 85 Hz, and I believe it could go higher, but some video cards can't handle much more, and not to mention that you won't notice the difference (settings much higher than 85)
Right click on your Desktop, properties>settings>advanced>MonitorTab> there should be a box to check "Hide modes that this monitor cannot display"
That will allow you to find your max refresh. (for that particular monitor, given that your computer knows what it is)
Retirement isn't all it's cracked up to be