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To break it down even further for the lazy, the 24" is HD, the 20" is not.

Ummm - what is HD? Is 720p not HD? Because the 20" is capable of that, right? I would say the 24" is capable of full 1080p, whereas the 20" is not, but still capable of lower-res HD.
 
To break it down even further for the lazy, the 24" is HD, the 20" is not.

This really isn't true. The definition (according to the CEA) of HDTV is 720 progressive or higher. This would qualify both iMacs as being High Definition.

Now, I suppose you could consider 1080p as "full" HD at this time and 720p as "partial HD." Nonetheless, they are both considered HD.
 
This really isn't true. The definition (according to the CEA) of HDTV is 720 progressive or higher. This would qualify both iMacs as being High Definition.

Now, I suppose you could consider 1080p as "full" HD at this time and 720p as "partial HD." Nonetheless, they are both considered HD.
Not that the extra 360p makes any difference on screens below 37".
 
Not that the extra 360p makes any difference on screens below 37".

There is a big time noticeable difference between 720 and 1080 on my 24" imac.


The 20" iMac will support upto 720P (1280x720 - 16:9)
The 24" iMac will support upto 1080P (1920x1080 - 16:9)

Obviously there will be black bars on the top and bottom of the screens b/c iMac's are not 16:9

Both are High Def, and both will look Amazing!
 
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