24" monitors vs 27"

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I have not gamed at 1440p, but you should find that 1440p will have a sharper image quality due to higher pixel density. There are no 1440p monitors that work at 120hz, unless you get one of those Japanese or Korean monitors that are overclocked to 100hz or better (though I hear their quality is quite poor). One problem is that 120hz requires a faster response time to prevent ghosting, and IPS monitors have poor response time.

Yes, the XL2420T has a Dual link DVI-D input (you need a dual link cable for 120hz).

As you already mentioned, going with the XL2420T requires a 3D Vision 2 kit, other than that, you shouldn't have to purchase anything, unless the monitor does not come with the dual link dvi-d cable.
1) You should be able to get the glasses and kit for $150. I'd rate it an 8. A 10 when it is completely bug free in a game, but close to half the games out there, I would not play with 3D, and only a few of the games that are good with 3D are perfect, but when it is, it's awesome.

2) 1080p and 1200p are not aspects, but they do represent resolutions with different aspect ratios. 1080p is short hand for 1920x1080. 1200p is short hand for 1920x1200, 1440p is short for 2560x1440 and 1600p is short for 2560x1600. 1080p and 1440p are 16:9 aspect ratios, and 1200p and 1600p are 16:10 aspect ratios.

Those resolutions numbers stand for how many pixels there are going horizontally, and vertically. A 1080p or 1920x1080 monitor has 1920 pixels left to right across the screen, and 1080 pixels going up and down.

16:9 is a ratio of pixels. 1920/16 = 1080/9.
 


Don't bother with a 27" monitor - no point, and most of them don't have decent DPI.

Gaming in 3d isn't really worth it, but gaming at 120hz is bloody AMAZING. I have that BenQ monitor and love it to death - there's nothing like it. (I have a single, overclocked GTX 670, and get between 80 and 120 fps depending on how old the game is.) If you really want the 3d, which does work on movies, get that model with -TX instead of -T. It comes with the built in emitter and glasses.
 
I have not gamed at 1440p, but you should find that 1440p will have a sharper image quality due to higher pixel density. There are no 1440p monitors that work at 120hz, unless you get one of those Japanese or Korean monitors that are overclocked to 100hz or better (though I hear their quality is quite poor). One problem is that 120hz requires a faster response time to prevent ghosting, and IPS monitors have poor response time.

Yes, the XL2420T has a Dual link DVI-D input (you need a dual link cable for 120hz).

As you already mentioned, going with the XL2420T requires a 3D Vision 2 kit, other than that, you shouldn't have to purchase anything, unless the monitor does not come with the dual link dvi-d cable.
 
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