Apple iPad 3 Retina display confirmed by iFixit

3. squallz506 posted on 23 Feb 2012, 18:29 1 3

if we dont know anything about either what is the difference?

7. Lucas777 posted on 23 Feb 2012, 19:21 2 0

um there were pics of an a5x processor… meaning a beefed up dual core, while an A6 would be quad core. personally i think apple is going to go with the a5x.. there is really no need for quad core

10. squallz506 posted on 23 Feb 2012, 20:41 2 3

lol, that picture had absolutely no specs on the processor. it probably is dual-core. but to say anything about these unannounced chips is pure speculation.

• This comment is posted in response to #7 Show
• This comment is posted in response to #7 Hide

14. Lucas777 posted on 23 Feb 2012, 21:47 0 0

lol, so we obviously know something… its quite clear that A5x will be dual core while A6 would be quad… no, it is not certain, but with a pic for the name of a second dual core, it is logical apple reserves full numbers for full upgrades

• This comment is posted in response to #10 Show
• This comment is posted in response to #10 Hide

4. Dr.Phil posted on 23 Feb 2012, 18:37 5 0

Not just Asus, but also Samsung is rumored to be pushing out a higher resolution tablet as well.

5. squallz506 posted on 23 Feb 2012, 18:39 3 3

even better.

9. sprockkets posted on 23 Feb 2012, 20:32 0 0

Don't we know already it has 1920x1200? Good enough for me.

11. scnix posted on 23 Feb 2012, 20:53 2 0

math.

13. Cwebb posted on 23 Feb 2012, 21:32 1 0

Wikipedia ftw, in case you were wondering

15. danilodeleon posted on 23 Feb 2012, 23:12 0 0

Pixels per inch (PPI) or pixel density is a measurement of the resolution of devices in various contexts; typically computer displays, image scanners, and digital camera image sensors.

PPI can also describe the resolution, in pixels, of an image to be printed within a specified space. Note, the unit is not square inches. For instance, a 100×100 pixel image that is printed in a 1-inch square has a resolution of 100 pixels per inch (PPI). Used in this way, the measurement is meaningful when printing an image. Good quality photographs usually require 300 pixels per inch when printed.
Now how does it works?

Theoretically, PPI can be calculated from knowing the diagonal size of the screen in inches and the resolution in pixels (width and height). This can be done in steps:

Calculate diagonal resolution in pixels using the Pythagorean theorem

17. ardent1 posted on 24 Feb 2012, 04:19 1 0

You need to know the size of a "pixel" is not standardized. Also, the math can be misleading since you can have two screens with same diagional display but different lengths and widths for the same pixel resolution, say 800x480. What I am saying is the diagonal display and pixel resolution is NOT sufficient since the math makes an assumption about pixel size, which may not be true.

The following website makes a key assumption that each pixel is a square and that is how you get to the 263/264 PPI for the iPad 3.http://members.ping.de/~sven/dpi.html

In summary, I measured numerous android devices with the same 4.3" diagonal display with about the same pixel resolution, but YOU CAN'T DISCERN ppi because the displays all had different widths -- HTC screens tend to be skinnier than Samsung displays despite the same 4.3" screen meaning the pixels were stretched in the Samsung devices. That theorem of c^2 = a^2 + b^2 for right triangles makes an assumption about the units being the same. Once you assume square pixels, you overcome the fact pixel sizes may not be uniform or standardized in size.