My old IBM G78 CRT would run at 75hz, with a maximum resolution of @ 1600 x 1200.
My LCD is a Samsung LN52A630. It's very simular to the
A650 in this review. It's a 120Hz (Auto Motion Plus) display that ranked very high in reviews, even being very comparable with what Pioneer had at the time. It supports 24hz for movies, but I'm not quite sure if it would support the 70hz and 75hz refresh rates. I've only used the PC port (Analog RGB) a couple of times with my laptop and my old Q9650 rig I'd built in 2010. It would be interesting to see what setting I could do with my i5-2500K/EVGA GTX 670 FTW! rig, but the last time I had connected it to this display, I'd used the HDMI port.
I run my games with Vsync enabled, and with Nvidia's Adaptive Vsync, the games run ultra smooth when the fps drops below 60fps. I get to keep my settings at 1080p, with most games set to the maximum settings. It's a win-win!
What model is your television?