iSight Camera in iPhone 5 , 5s, 5c: Is the image resolution 3264 x 2448 or 3284 x 2448? Apple said iPhone 5, 5s, 5c has 8MP iSight camera.

A website says


iSight of 5c & 5s: 3264 x 2448 Pixels  (7.99 MP)
http://www.devicespecifications.com/en/comparison/157b258a
http://www.devicespecifications.com/en/model/70af28ac

iSight of iPhone 5: 3284 x 2448 Pixels (8.4 MP)
http://www.devicespecifications.com/en/comparison/aba74df9


Don't the iSight of 5, 5c, 5s have the same resolution? Something seems inaccurate here. So what is the exact number?
The iPhone 5 spec given is definitely wrong (2) and the 3 have the same resolution :  3284 * 2448 => 8.4 Mpx.