I'll have to disagree with this, a 120Hz monitor won't have much of an impact. Sure, military tests have shown that the human eye can register 1000+ fps, but being able to see 60 fps more than your opponents will not make a difference other than maybe a tiny psychological one.
I haven't done much research on this so I might be off, but from what I've seen the only people who geek out over 120Hz monitors seem to be CS kids.
Don't start this ****. Your debating something which is based on myth and bull****; it's been debated and unfortunately I don't know if it's consoles or ignorance and or both but the myth is still perpetuated.
Like I said in a previous thread a few days ago. "The human eye will see whatever the hell it wants to see".
While I'm mostly speaking about gaming, any activity you do benefits from higher refresh rate. Remember the computer draws frames and the monitor refreshes all the time even if your desktop is pumping out 15,000FPS.
Actually the 120hz monitors are somewhat in the wrong they should actually be at 125Hz so the monitors refresh rate and framerate better match the most commonly used mice polling rate divisors 125hz, 250hz, 500hz, and 1000hz. Although that's pushing it to the extreme when it comes to consistency still there's really no adjustable polling rate matching to better divide the 120Hz.
Many other games benefit from them even slower shooters or even divisor(greater/lower) framerates like 30FPS and 120hz or 480fps and 120hz. Plus it reduces anomalies by 50% compared to a 60hz monitor and eliminates the need to vsync when using 60FPS if your stick with 60FPS. Remember your drawing twice as many frames per second, in essence a 120Hz user is seeing twice as much information compared to a 60Hz user(16.6666667ms vs 8.33333333ms) so the 120hz user is seeing 60 more complete frames over the time period of a second compared to 60hz user.
And it's not just LCDs but CRTs there's a reason why even to this day some stick to their high-end aperture grille CRT, if they are lucky to have one hell even crappy CRTs are still faster despite phosphor decay response time issues(phosphor quality and age). Aside from superior image quality, refresh rate, and zero input lag. Many of the high end CRTs did insane refresh rates some able to surpass 200Hz refresh rate even at a respectable usable resolution. So 120hz isn't the end all be all there was a time before that had refresh rates higher than what we currently have.
As for Counter-Crap as much as I hate it; it's a quake engine game. In quake the more frame rates you have the more you calculate the netcode and other intricacies of the game. Although there are magic numbers(67, 76, 81, 91, ((125, 250, 333))) which provide you with greater benefits(jumping higher vertically and further horizontally, better hit detection and hit avoidance, faster run speed, faster shooting, bounce and superbounce, footsteps with little to no sound etc.etc.) So you use a higher refresh rate to better match the frame rates to the server. For quake engine games framerates are very important, somewhat similar case with Unreal engine were framerates over I believe 91 or 96 begin to provide significant smoother feel as it increases compared to other engines. Plus even if the engine isn't coded in some specific way or operating in some specific way the higher refresh rate provides a better image quality especially in motion. Makes things less jittery and more smoother, more updates.
Most people won't notice a difference because they never been exposed to higher refresh rates nor pay attention to the differences. Sorta like people who can't notice the difference between higher resolution television and their SD channels, either they are blind or no one points out the difference and they just think there is no difference.
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You don't get 120Hz TN, you only get that frequency on CRT.
But I agree, I'd much rather have a decent IPS monitor.
There's a big misconception that the 120hz LCD monitors are fake they are real and they use dual-link DVI to process image. They don't interpolate but they do have higher response times per shades and colors compared to a CRT so their 120hz is pound for pound less faster than a 120hz CRT. Remember the 120hz LCDs are still 80-85% as good as a CRT, high-end aperture grille still beat 120hz in image quality(both regular IQ and input lag reduction overdrive requirement for some 120hz LCDs), black levels, response time(ignoring phosphor decay and phosphor material quality and age degradation) and input lag.
Yes an IPS is very nice and some have even notice some companies working on 120hz IPS panel albeit at outrages price premiums and with unfortunately interpolation. But for some people they'd rather have the pure speed over the IQ because they are so used to the speed that an IPS just completely hinders their enjoyment of the game. This is one of the reasons why OLED can't arrive any sooner at least then speed and image quality can finally return to flat-panel technologies like the CRT before always had.