iMac power consumption and thermal output

Learn about the power consumption and thermal output (BTU) of iMac computers. 

iMac (Retina 5K, 27-inch, 2017)
27-inch Retina 5K display, 4.2GHz Intel Quad-Core i7, 64GB 2400MHz DDR4 SDRAM, 3TB Fusion Drive, AMD Radeon Pro 580 with 8192MB memory
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
71W 217W 242 BTU/h 741 BTU/h
iMac (Retina 4K, 21.5-inch, 2017)
21.5-inch Retina 4K display, 3.6GHz Intel Quad-Core i7, 32GB 2400MHz DDR4 SDRAM, 512GB Solid State Drive, AMD Radeon Pro 560 with 4096MB memory
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
49W 161W 168 BTU/h 550 BTU/h
iMac (21.5-inch, 2017)
21.5-inch display, 2.3GHz Intel Dual-Core i5, 16GB 2400MHz DDR4 SDRAM, 256GB Solid State Drive
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
33W 74W 113 BTU/h 253 BTU/h
iMac (Retina 5K, 27-inch, Late 2015)
27-inch Retina 5K display, 4.0GHz Intel quad-core Core i7, 32GB 1866MHz DDR3L SDRAM, 3TB Fusion Drive, AMD Radeon R9 M390 with 2GB memory
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
63W 240W 215 BTU/h 819 BTU/h
iMac (Retina 4K, 21.5-inch, Late 2015)
21.5-inch Retina 4K display, 3.3GHz Intel quad-core Core i7, 16GB 1866MHz LPDDR3 SDRAM, 2TB Fusion Drive
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
40W 119W 136 BTU/h 406 BTU/h
iMac (21.5-inch, Late 2015)
21.5-inch display, 1.6GHz Intel dual-core Core i5, 16GB 1866MHz LPDDR3 SDRAM, 1TB Fusion Drive
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
33W 58W 113 BTU/h 198 BTU/h
iMac (Retina 5K, 27-inch, Mid 2015)
27-inch display, 3.3GHz Intel Core i5, 32GB 1600MHz DDR3 SDRAM, 3TB Fusion Drive, AMD Radeon R9 M290
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
70W 197W 239 BTU/h 673 BTU/h
iMac (27-inch, Late 2014)
27-inch display, 4GHz Intel Core i7, 32GB 1600MHz DDR3 SDRAM, 3TB Fusion Drive, AMD Radeon R9 M295X with 4096MB memory
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
70W 288W 239 BTU/h 983 BTU/h
iMac (21.5-inch, Mid 2014)
21.5-inch display, 1.4GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 500GB HDD, integrated graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
33W 68W 113 BTU/h 232 BTU/h
iMac (Late 2013)
iMac (21.5-inch, Late 2013)
21.5-inch display, 3.1GHz Intel Core i7, 16GB 1600MHz DDR3 SDRAM, 1TB Fusion Drive, NVIDIA GeForce GT 755M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
37W 136W 126 BTU/h 463 BTU/h
iMac (21.5-inch, Late 2013)
21.5-inch display, 2.9GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 1TB Serial ATA Hard Drive, NVIDIA GeForce GT 750M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
37W 94W 127 BTU/h 322 BTU/h
iMac (21.5-inch, Late 2013)
21.5-inch display, 2.7GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 1TB Serial ATA Hard Drive, Intel Iris Pro Graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
38W 91W 129 BTU/h 311 BTU/h
iMac (27-inch, Late 2013)
27-inch display, 3.4GHz Intel Core i7, 32GB 1600MHz DDR3 SDRAM, 3TB Fusion Drive, NVIDIA GeForce GTX 775M
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
78W 229W 266 BTU/h 782 BTU/h
iMac (27-inch, Late 2013)
27-inch display, 3.4GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 1TB Serial ATA Hard Drive, NVIDIA GeForce GTX 775M
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
80W 214W 274 BTU/h 729 BTU/h
iMac (27-inch, Late 2013)
27-inch display, 3.2GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 1TB Serial ATA Hard Drive, NVIDIA GeForce GT 755M
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
78W 180W 268 BTU/h 615 BTU/h
iMac (21.5-inch, Late 2011)
21.5-inch display, 3.1GHz Intel Core i3, 2GB 1333MHz DDR3 SDRAM - 2x2GB, 250GB Serial ATA hard drive, AMD Radeon HD 6750M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
80W 101W 273 BTU/h 345 BTU/h
iMac (21.5-inch, Mid 2011)
21.5-inch display, 2.5GHz Intel Core i5, 4GB 1333MHz DDR3 SDRAM - 2x2GB, 500GB Serial ATA hard drive, AMD Radeon HD 6750M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
81W 106W 276 BTU/h 362 BTU/h
iMac (21.5-inch, Mid 2011)
21.5-inch display, 2.7GHz Intel Core i5, 4GB 1333MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, AMD Radeon HD 6770M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
85W 114W 290 BTU/h 389 BTU/h
iMac (27-inch, Mid 2011)
27-inch display, 2.7GHz Intel Core i5, 4GB 1333MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, AMD Radeon HD 6770M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
135W 170W 461 BTU/h 580 BTU/h
iMac (27-inch, Mid 2011)
27-inch display, 3.1GHz Intel Core i5, 4GB 1333MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, AMD Radeon HD 6970M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
139W 195W 474 BTU/h 665 BTU/h
iMac (27-inch, Mid 2011)
27-inch display, 3.4GHz Intel Core i7, 4GB 1333MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, AMD Radeon HD 6970M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
142W 200W 485 BTU/h 682 BTU/h
iMac (Mid 2010)
21.5-inch display, 3.6GHz Intel Core i5, 4GB 1333MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, ATI Radeon 4670 graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
94W 241W 321 BTU/h 822 BTU/h
iMac (27-inch, Mid 2010)
27-inch display, 3.2GHz Intel Core i3, 4GB 1333MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, ATI Radeon 5670 graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
* 365W * 1,245 BTU/h
iMac (27-inch, Mid 2010)
27-inch display, 3.6GHz Intel Core i5, 4GB 1333MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, ATI Radeon 5670 graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
145W 365W 495 BTU/h 1,245 BTU/h 
iMac (21.5-inch, Late 2009)
21.5-inch display, 3.33GHz Intel Core 2 Duo, 4GB 1066MHz DDR3 SDRAM - 2x2GB, 500GB Serial ATA hard drive, NVIDIA GeForce 9400M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
104W 241W  355 BTU/h 822 BTU/h
iMac (21.5-inch, Late 2009)
21.5-inch display, 3.2GHz Intel Core i3, 4GB 1333MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, NVIDIA GeForce 9400M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
104W 241W  355 BTU/h 822 BTU/h
iMac (27-inch, Late 2009)
27-inch display, 3.06GHz Intel Core 2 Duo, 4GB 1066MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, ATI Radeon 4670 graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
* 365W * 1,245 BTU/h
iMac (27-inch, Late 2009)
27-inch display, 3.33GHz Intel Core 2 Duo, 4GB 1066MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, ATI Radeon 4670 graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
* 365W * 1,245 BTU/h
iMac (27-inch, Late 2009)
27-inch display, 2.66GHz Quad-core Intel i5, 4GB 1066MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, ATI Radeon 4850 graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
145W 365W * 1,245 BTU/h
iMac (20-inch, Early 2009)
20-inch display, 2.66GHz Intel Core 2 Duo, 2GB 1066MHz DDR3 SDRAM - 2x1GB, 320GB Serial ATA hard drive, NVIDIA GeForce 9400M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
60.7W 108.9W 206.4 BTU/h 371.6 BTU/h
iMac (24-inch, Early 2009)
24-inch display, 2.66GHz Intel Core 2 Duo, 4GB 1066MHz DDR3 SDRAM - 2x2GB, 640GB Serial ATA hard drive, NVIDIA GeForce 9400M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
104.4W 151.5W 355 BTU/h 515.2 BTU/h
iMac (24-inch, Early 2009)
24-inch display, 2.93GHz Intel Core 2 Duo, 4GB 1066MHz DDR3 SDRAM - 2x2GB, 640GB Serial ATA hard drive, NVIDIA GeForce GT 120 graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
116.4W 192.2W 395.8 BTU/h 653.5 BTU/h
iMac (24-inch, Early 2009)
24-inch display, 3.06GHz Intel Core 2 Duo, 4GB 1066MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, NVIDIA GeForce GT 130 graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
113.9W 208.9W 387.3 BTU/h 710.3 BTU/h
iMac (24-inch, Early 2009)
24-inch display, 3.06GHz Intel Core 2 Duo, 4GB 1066MHz DDR3 SDRAM - 2x2GB, 1TB Serial ATA hard drive, ATI Radeon HD 4850 graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
125.5W 215.7W 426.7 BTU/h 733.4 BTU/h
  1. Power consumption data (watts) is measured from the wall power source and includes all power supply and system losses. Additional correction isn't needed.
  2. CPU Max is defined as running a compute-intensive test application that maximizes processor usage and therefore power consumption.
  3. These numbers reflect a 23°C (73.4°F) ambient running environment. Increased ambient temperatures requires faster fan speeds which increases power consumption. At 35°C (95°F), 50W should be added to reflect increased power consumption.
  4. Available for education institutions only.

*Information not available.

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