iMac power consumption and thermal output

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

Power Consumption		Thermal Output
iMac (24-inch, M1, 2021) 23.5-inch Retina 4.5K display, M1 8-Core CPU & 7-Core GPU, 16GB unified memory, 1TB SSD
Idle	CPU Max	Idle	CPU Max
43W	80W	147 BTU/h	274 BTU/h

Power Consumption		Thermal Output
iMac (24-inch, M1, 2021) 23.5-inch Retina 4.5K display, M1 8-Core CPU & 8-Core GPU, 16GB unified memory, 2TB SSD
Idle	CPU Max	Idle	CPU Max
43W	84W	147 BTU/h	286 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
74W	295W	252 BTU/h	1007 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
71W	262W	242 BTU/h	895 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
47W	166W	161 BTU/h	568 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
71W	217W	242 BTU/h	741 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
49W	161W	168 BTU/h	550 BTU/h

Power Consumption		Thermal Output
iMac (21.5-inch, 2017) 21.5-inch display, 2.3GHz Intel Dual-Core i5, 16GB 2400MHz DDR4 SDRAM, 256GB Solid State Drive
Idle	CPU Max	Idle	CPU Max
33W	74W	113 BTU/h	253 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
63W	240W	215 BTU/h	819 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
40W	119W	136 BTU/h	406 BTU/h

Power Consumption		Thermal Output
iMac (21.5-inch, Late 2015) 21.5-inch display, 1.6GHz Intel dual-core Core i5, 16GB 1866MHz LPDDR3 SDRAM, 1TB Fusion Drive
Idle	CPU Max	Idle	CPU Max
33W	58W	113 BTU/h	198 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
70W	197W	239 BTU/h	673 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
70W	288W	239 BTU/h	983 BTU/h

Power Consumption		Thermal Output
iMac (21.5-inch, Mid 2014) 21.5-inch display, 1.4GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 500GB HDD, integrated graphics
Idle	CPU Max	Idle	CPU Max
33W	68W	113 BTU/h	232 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
37W	136W	126 BTU/h	463 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
37W	94W	127 BTU/h	322 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
38W	91W	129 BTU/h	311 BTU/h

Power Consumption		Thermal Output
iMac (27-inch, Late 2013) 27-inch display, 3.4GHz Intel Core i7, 32GB 1600MHz DDR3 SDRAM, 3TB Fusion Drive, NVIDIA GeForce GTX 775M
Idle	CPU Max	Idle	CPU Max
78W	229W	266 BTU/h	782 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
80W	214W	274 BTU/h	729 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
78W	180W	268 BTU/h	615 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
80W	101W	273 BTU/h	345 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
81W	106W	276 BTU/h	362 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
85W	114W	290 BTU/h	389 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
135W	170W	461 BTU/h	580 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
139W	195W	474 BTU/h	665 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
142W	200W	485 BTU/h	682 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
94W	241W	321 BTU/h	822 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
*	365W	*	1,245 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
145W	365W	495 BTU/h	1,245 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
104W	241W	355 BTU/h	822 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
104W	241W	355 BTU/h	822 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
*	365W	*	1,245 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
*	365W	*	1,245 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
145W	365W	*	1,245 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
60.7W	108.9W	206.4 BTU/h	371.6 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
104.4W	151.5W	355 BTU/h	515.2 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
116.4W	192.2W	395.8 BTU/h	653.5 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
113.9W	208.9W	387.3 BTU/h	710.3 BTU/h

Power Consumption		Thermal Output
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
Idle	CPU Max	Idle	CPU Max
125.5W	215.7W	426.7 BTU/h	733.4 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.

Published Date: June 21, 2021