Apple today completely revised its iMac with a new design and much faster performance. The series now switches to wider 16:9 aspect ratio, LED-backlit displays and a new look with edge-to-edge glass and a seamless aluminum body. The displays are also much denser and start at 1920x1080 (1080p) for a 21.5-inch display and an extremely sharp 2560x1440 for a new, largest-ever 27-inch model. Both now use color-accurate IPS (in-plane switching) displays versus the cheaper TN (twisted nematic) panel from the old 20-inch iMac.
