iMac power consumption and thermal output

Mac power consumption and thermal output

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

iMac (24-inch, M1, 2021) 
23.5-inch Retina 4.5K display, M1 8-Core CPU & 7-Core GPU, 16GB unified memory, 1TB SSD
Power ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
43W80W147 BTU/h274 BTU/h
iMac (24-inch, M1, 2021)
23.5-inch Retina 4.5K display, M1 8-Core CPU & 8-Core GPU, 16GB unified memory, 2TB SSD
Power ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
43W84W147 BTU/h286 BTU/h
iMac (Retina 5K, 27-inch, 2020)
27-inch Retina 5K display, 3.6GHz 10-Core i9, 128GB 2666MHz DDR4 SDRAM, 8TB Solid State Drive, AMD Radeon Pro 5700 XT with 16GB memory
Power ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
74W295W252 BTU/h1007 BTU/h
iMac (Retina 5K, 27-inch, 2019)
27-inch Retina 5K display, 3.6GHz Intel 8-Core i9, 64GB 2666MHz DDR4 SDRAM, 3TB Fusion Drive, AMD Radeon Pro Vega 48 with 8GB memory
Power ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
71W262W242 BTU/h895 BTU/h
iMac (Retina 4K, 21.5-inch, 2019)
21.5-inch Retina 4K display, 3.2GHz Intel 6-Core i7, 32GB 2666MHz DDR4 SDRAM, 1TB Solid State Drive, AMD Radeon Pro Vega 20 with 4GB memory
Power ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
47W166W161 BTU/h568 BTU/h
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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
71W217W242 BTU/h741 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
49W161W168 BTU/h550 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
33W74W113 BTU/h253 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
63W240W215 BTU/h819 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
40W119W136 BTU/h406 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
33W58W113 BTU/h198 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
70W197W239 BTU/h673 BTU/h
iMac (Retina 5K, 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
70W288W239 BTU/h983 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
33W68W113 BTU/h232 BTU/h
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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
37W136W126 BTU/h463 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
37W94W127 BTU/h322 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
38W91W129 BTU/h311 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
78W229W266 BTU/h782 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
80W214W274 BTU/h729 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
78W180W268 BTU/h615 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
80W101W273 BTU/h345 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
81W106W276 BTU/h362 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
85W114W290 BTU/h389 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
135W170W461 BTU/h580 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
139W195W474 BTU/h665 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
142W200W485 BTU/h682 BTU/h
iMac (21.5-inch, 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
94W241W321 BTU/h822 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
145W365W495 BTU/h1,245 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
104W241W 355 BTU/h822 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
104W241W 355 BTU/h822 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
145W365W*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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
60.7W108.9W206.4 BTU/h371.6 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
104.4W151.5W355 BTU/h515.2 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
116.4W192.2W395.8 BTU/h653.5 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
113.9W208.9W387.3 BTU/h710.3 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 ConsumptionThermal Output
IdleCPU MaxIdleCPU Max
125.5W215.7W426.7 BTU/h733.4 BTU/h

* Information not available.

Notes

  • Power consumption data (watts) is measured from the wall power source and includes all power supply and system losses. Additional correction isn’t needed.
  • CPU Max is defined as running a compute-intensive test application that maximizes processor usage and therefore power consumption.
  • These numbers reflect a 23°C (73.4°F) ambient running environment. Increased ambient temperatures require faster fan speeds which increases power consumption. At 35°C (95°F), 50W should be added to reflect increased power consumption.

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