Apple upgrades iMacs with quad-core processors

NEW YORK — Apple Inc. on Tuesday released an upgraded line of iMac desktop computers with faster processors, higher-resolution cameras and a new type of data port.

The new iMacs all have Intel quad-core processors, which had been available as an upgrade to the standard dual-core processors of the previous generation. Apple said the new models are up to 70 percent faster.

The new 21.5-inch (54.61-centimeter) iMac has a single Thunderbolt port, which can carry data at speeds 20 times faster than most current USB ports. It can also connect to additional monitors. The 27-inch (68.58-centimeter) iMac has two Thunderbolt ports.

Apple introduced Thunderbolt on MacBook Pro laptops in February. The port was developed by Intel Corp.

The 21.5-inch (54.61-centimeter) iMac starts at $1,199, the larger model at $1,699.

Apple last revamped its iMacs in July 2010.