Apple upgrades iMacs with quad-core processors

CUPERTINO, Calif.

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

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

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

The 21-inch iMac starts at $1,199, the larger model at $1,699.

Apple last revamped its iMacs in October 2009.

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