Apple upgrades iMacs with quad-core processors
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.
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