The human eye can only process 25 FPS
That is the biggest load of rubbish being repeated on the internet like so many dodo birds jumping off a cliff.
Humans can detect extremely high FPS rates and I can see the difference over 80fps myself.
TV frames are not the same as video frames on a PC game, they are transitioned smoothly. PC games fps are stark images with no blending from one frame into the next like a movie or TV transmission. It's a totally different way of displaying the image.
Most people can easily pick up 50 - 60 fps at least. Test it yourself by noticing the flicker of moving light bulb or flourescent lamp.
Any light on mains power (50-60hz or 50 -60 fps ) will show up as a dotted line if moved quickly in darkness.
The most obvious demonstration is swinging a string of Christmas lights around in a circle, a very pretty, but very broken pattern of light emerges as you detect the gaps as the mains power cycles on and off.
Pass your hand in front of your eyes when looking at your monitor or watching TV and see multiple images of your hand as it passes the image frames being displayed. My monitor is set to 85hz and yet I can easily see the flicker as an object passes in front of it.
By contrast, a DC light source will not flicker as the light is being emitted constantly.
It's silly to repeat untrue rhetoric when giving advice.

Mainboard: Asus P5K-Premium, CPU=Intel E6850 @ x8x450fsb 3.6ghz, RAM: 4gb PC8500 Team Dark, Video: NV8800GT, HDD: 2x1Tb Samsung F3 RAID-0 + 1Tb F3, PSU: Antec 550 Basiq, OS: Win7x64, Display: 24&