Hi, I have an old Acer V243H monitor from 2011 it has 50-60Hz I believe, and I use it on my work Mac. I am building a gaming pc for around $900 and I want it with a new monitor. But then I realized since I already have a monitor with 60Hz I wouldn't need one with 144Hz. If I keep my old monitor I can raise the price of my Gaming PC and get better performance out of it. But, I am afraid that if I keep my old monitor I will not see as good performance. Also, How many frames in a second can the eye see? If I do get a new monitor I am looking at the BenQ XL2420Z.