Specifications

iMac (21.5-inch, Late 2012)
Display
21.5-inch (diagonal) LED-backlit display with IPS technology; 1920-by-1080 resolution with support for millions of colors
Processor
2.7GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.2GHz) with 6MB L3 cache
2.9GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache
3.1GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz) (CTO)
Memory
8GB (two 4GB) of 1600MHz DDR3 memory (Configurable to 16GB)
Graphics and video support
NVIDIA GeForce GT 640M graphics processor with 512MB of GDDR5 memory
NVIDIA GeForce GT 650M graphics processor with 512MB of GDDR5 memory
Storage Options
1TB (5400-rpm) hard drive
1TB Fusion Drive
iMac (27-inch, Late 2012)
Display
27-inch (diagonal) LED-backlit display with IPS technology; 2560-by-1440 resolution with support for millions of colors
Processor
2.9GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache
3.2GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache
3.4GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz) (CTO)
Memory
8GB (two 4GB) of 1600MHz DDR3 memory; four user-accessible SO-DIMM slots (configurable to 16GB or 32GB)
Graphics and video support
NVIDIA GeForce GTX 660M graphics processor with 512MB of GDDR5 memory
NVIDIA GeForce GTX 675MX graphics processor with 1GB of GDDR5 memory (configurable to NVIDIA GeForce GTX 680MX with 2GB of GDDR5
memory)
Storage Options
1TB (7200-rpm) hard drive (configurable to 3TB hard drive)
1TB or 3TB Fusion Drive
768GB of flash storage
Connections and Expansion