Okay thanks every one for helping me understand..
I guess I am confused on how some thing with a slower refresh could be faster than the maximum refresh speed..
Like how could switching to 100hz temporarily, be faster than just staying at 120hz v-sync constantly?..
If you are playing a high-paced FPS game or some thing, and your monitor goes up to 120hz, why would you ever want to switch to any thing less than 120hz during that period?.. Even if your monitor is 120hz max with adaptive-sync technology, why would the sync ever choose less than 120hz during your FPS game?.. I realize that with adaptive-sync it can tell the monitor "Hey, I'm done with a frame, so you can show it now"...but it can only do that up to 120hz (because that is your monitor's hardware limit)..
The only time I see adaptive-sync being used is if you are doing desktop work and your windows aren't changing constantly at 120hz like a FPS game would be.. Then adaptive-sync could safely lower the refresh-rate.. But in a FPS game, the adaptive-sync is already going to want to refresh the screen as often as possible, isn't it? Which would be the equivilent to v-sync stuck at constant 120hz.. So there would end up being no different during that FPS game..
To help you understand, I will use an analogy:
Pretend that you have a restaurant called the "v-sync restaurant", but it can only serve food at specific intervals (like v-sync).. Your restaurant can only serve food to a new customer at a maximum of 1 minute intervals.. So if a customer comes in at 17:00:01, they have to wait 59 seconds (until 17:01:00) to be served by you.. Since you are v-sync, you ALWAYS have to come out from the back (every 1 minute) to check if new customers have arrived or not.. So that wastes energy for you to check every 1 minute, even if a new customers isn't there yet.. (v-sync refreshes every frame, no matter what).. You can not change speeds.. Even when the restaurant is very slow, you have to keep checking every 1 minute (polling) because you have no other way to know if new customers are there or not.. Now, you have the ability to SWITCH your polling interval (refresh) to some thing slower, like 5 minutes.. (changing refresh down from 120hz to like 30hz or some thing) And that makes you work less (use less energy), but if a customer comes in at the wrong time like 18:00:01 then they have to wait 4 minutes 59 seconds for you to serve them.. So there is an obvious disadvantage to polling slower..
Now imagine an other restaurant called the "adaptive-sync" restaurant.. It has a bell thingy on the front desk that customers can ring to tell you "I'm here!".. This is great news if you operate this restaurant, because now you can stop polling/checking every 1 or 5 minutes, and you can just relax in the back room, and customers will notify you their selves, by ringing that bell.. So when the restaurant is slow or virtually dead, you can relax for a long time in the back with out having to check all the time.. You only serve a customer when they NEED to be served.. They ring the bell at 18:00:07, and you serve them at 18:00:07.. That is some thing that the v-sync restaurant just can't do.. That is amazing..
However, at busy times when the restaurant is fully packed with people (when you are running FPS game), you are receiving so many customers that you eventually hit your limit, and can't work any faster.. The fastest you can go is 1 customer per 1 minute..(120hz-capable monitor) This is no different now from the v-sync restuarant, who also have a limit of 1 customer per 1 minute.. So when both restaurants are full, and have customers (frames) being thrown at them as fast as they can take them, they reach a limit of how fast they can process each customer (frame)..
So yes, if an adaptive-sync monitor isn't already going the maximum speed that it can, it has the ability to make a frame show up even if it isn't with in the specified polling interval like v-sync has to abide by.. This is adaptive-sync's advantage..
However, games will try to push through as many frames as possible (unless you are just staring at an unmoving scene with no pixels changing at all).. adaptive-sync is an improvement over v-sync, but doesn't give the monitor magickal powers.. It still can't make the monitor go any faster than, say, 120hz.. If the game is already pushing through 120fps, what room does adaptive-sync have to improve the experience? The only thing it can do at that point is LOWER the rate..since it can't possible raise it because of the monitor hardware limit.. And it doesn't want to lower it, because why the hell would you lower the rate when you already have crap-loads of frames that are coming through??.. Why would the adaptive-sync restaurant guy decide to LOWER his speed at the time when the restaurant is being inundated with customers?.. That would make no sense..
Now, I want every one to apologize to me 1000 times and then bow to me and admit that I actually knew what I was talking about this entire time..
And no I'm not a troll, sadly this is actually my personality.. Although when I say things like that, I'm just joking around, I'm not really that arrogant actually..
P.S.: I do think that adaptive-sync is still an improvement over v-sync.. I would love to have an adaptive-sync monitor..