The iMac Family

iMac 21.5-inch

21.5-inch (diagonal), 1920-by-1080 screen resolution sRGB Display
8GB DDR3 1600MHz of RAM
OS X El Capitan
Photos, iMovie, GarageBand, Pages, Numbers, Keynote
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RM 4,599
1.6GHz 5th Generation Dual-Core i5 Processor
1TB Hard Drive
Intel HD Graphics 6000
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RM 5,499
2.8GHz 4th Generation Quad-Core i5 Processor
1TB Hard Drive
Intel Iris Pro 6200 Graphics

iMac 21-inch 4K Retina Display

RM 6,349
Retina 4K 4096x2304 P3 display
8GB DDR3 1600MHz of RAM
OS X El Capitan
Photos, iMovie, GarageBand, Pages, Numbers, Keynote
1TB Hard Drive (7200-RPM)
3.2GHz 4th Generation Quad-Core i5 Processor
Intel Iris Pro Graphics 6200
* All iMac model features : 4 USB3.0 Ports, SDXC Card Reader and 2 Thunderbolt port.