Whats the difference between a 2400 hundred player and a 2800 player?

May be cos Hikaru chugs on gallons and gallons of red bull before the game.RedBull sponsors the dude man!! So am sure its the Redbull that makes the difference btw a 2400 and 2800 player.

the same difference that is between a 1200 rated player and 800 rated player. 

The scale is not linear it`s more logarithmic. To go from 800 to 1200, under suitable practice techniques may take a month or two, however to go from 2400 to 2800 will take much longer, years if it is at all within the capabilities of that person.

It would be nice to understand the nuances between a GM and a Super-GM, but I suspect one would have to approach that level before one could even appreciate the nuances.

One difference is that a 2800 rate player is always a professional player who has devoted his life to chess.

A 2400 rated player is usually an amature who does not make a living by playing in chess tournaments. The 2400 rated player will not have spent the tens of thousands of hours needed to become a pro.

Not to mention the 2800 rated players have more natural talent anyway... 

The difference is one will beat you, the other will stomp on your guts. 

It's time for FIDE to get real, GM Nisipeanu and I have exchanged views about this many years ago, and it's apparent now more than ever:

FIDE Should create:

GM

SGM

EGM

Grandmaster, Superior GM, Elite GM

Obviously Carlsen is elite and the 14 guys behind him. So top 15 is EGM group.

Strap on the hip waiters. The BS keeps piling up.

The 2400 hundred player has a fake rating.

If we are honest, no one here will be able to truthfully answer what makes the difference between a 2400 and a 2800 player. 

We like to think we know, and we like to think we can backwards rationalize thought be going over the games post hoc. But in reality, what goes on in the mind of 2800s is largely a mystery to normal players. Sure, on a base level they "see better tactics, more deeply into the position, farther ahead" and other trivial non-answers. But a more accurate way to say it would be that they see in color, while the rest of us see in black and white. They speak a language we don't have access to. We don't have a conception of what is going on in their mind. It is an epistemic issue. It's not that they know things we know we don't know. It's that the things they know, we have no idea we don't know, nor even know exist in order to be known. 

Right! Chess improvement is an example of Exponential Decay.....fast at first, then comes slower, like in the third graph down in this link:

https://people.richland.edu/james/lecture/m116/logs/models.html

The difference between a GM in America and a pizza is that the pizza can feed a family of four.  A 2800 player in America can feed himself and a small dog off his chess earnings.   

I'd just be happy to get the word nuances 3 times in the one sentence cos then I'd understand the nuances of all the new answers.

Both 2400 hundred and 2800 hundred players would absolutely decimate the most powerful engines nowadays. 2400 hundred and 2800 hundred is 240,000 and 280,000...

Who cares?  None of us will ever approach either.

400 points

People who are telling about better tactics....

as they say,"Chess is 99% tactics"

According to Nakamura he said Tactics don't play much of a role after --2400.