http://www.apple.com/imac/
Processor and memory
21.5-inch models, one of the following:
3.06GHz Intel Core i3 processor with 4MB level 3 cache; supports
Hyper-Threading
3.2GHz Intel Core i3 processor with 4MB level 3 cache; supports
Hyper-Threading and Turbo Boost
3.6GHz Intel Core i5 processor with 4MB level 3 cache; supports
Hyper-Threading and Turbo Boost
27-inch models, one of the following:
3.2GHz Intel Core i3 processor with 4MB level 3 cache; supports
Hyper-Threading and Turbo Boost
3.6GHz Intel Core i5 processor with 4MB level 3 cache; supports
Hyper-Threading and Turbo Boost
2.8GHz Quad-Core Intel Core i5 processor with 8MB level 3 cache;
supports Turbo Boost
2.93GHz Quad-Core Intel Core i7 processor with 8MB level 3
cache; supports Hyper-Threading and Turbo Boost
4GB (two 2GB SO-DIMMs) of 1333MHz DDR3 SDRAM; four SO-DIMM slots
support up to 16GB
Configure your iMac now, only at the Apple Online Store.
Storage5
21.5-inch models:
500GB or 1TB 7200-rpm Serial ATA hard drive
Optional 2TB 7200-rpm Serial ATA hard drive
27-inch models:
1TB 7200-rpm Serial ATA hard drive
Optional 2TB 7200-rpm Serial ATA hard drive
Optional 256GB solid-state drive
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watchman