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iMac: Power consumption and thermal output (BTU) information

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

21.5-inch display,  1.4 GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 500GB HDD, integrated graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
33 W 68 W 113 BTU/h 232 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 GK107 GX graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
37 W 136 W 126 BTU/h 463 BTU/h
21.5-inch display, 2.9GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 1TB Serial ATA Hard Drive, NVIDIA GK107 GX graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
37 W 94 W 127 BTU/h 322 BTU/h
21.5-inch display, 2.7GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 1TB Serial ATA Hard Drive, integrated graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
38 W 91W 129 BTU/h 311 BTU/h
27-inch display, 3.4GHz Intel Core i7, 32GB 1600MHz DDR3 SDRAM, 3TB Fusion Drive, NVIDIA GK104 GX graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
78 W 229 W 266 BTU/h 782 BTU/h
27-inch display, 3.4GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 1TB Serial ATA Hard Drive, NVIDIA GK104 GX graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
80 W 214W 274 BTU/h 729 BTU/h
27-inch display, 3.2GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 1TB Serial ATA Hard Drive, NVIDIA GK107 GX graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
78 W 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
80 W 101 W 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
81 W 106 W 276 BTU/h 362 BTU/h
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
85 W 114W 290 BTU/h 389 BTU/h
27-inch display, 2.7GHz Intel Core i5, 4GB 1333MHz DDR3 SDRAM - 2x2GB, 1TBGB Serial ATA hard drive, AMD Radeon HD 6770M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
135 W 170 W 461 BTU/h 580 BTU/h
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
139 W 195W 474 BTU/h 665 BTU/h
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
142 W 200W 485 BTU/h 682 BTU/h
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
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
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
145 W 365 495 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
104 W 241 W  355 BTU/h 822 BTU/h
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
104 W 241 W  355 BTU/h 822 BTU/h
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
* 365 W * 1,245 BTU/h
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
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
145 W 365 * 1,245 BTU/h
20-inch display, 2.66GHz Intel Core 2 Duo, 2GB 1066MHz DDR3 SDRAM - 2x1GB, 320GB Seral ATA hard drive, NVIDIA GeForce 9400M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
60.7 W 108.9 W 206.4 BTU/h 371.6 BTU/h
24-inch display, 2.66GHz Intel Core 2 Duo, 4GB 1066MHz DDR3 SDRAM - 2x2GB, 640GB Seral ATA hard drive, NVIDIA GeForce 9400M graphics
Power Consumption Thermal Output
Idle CPU Max Idle CPU Max
104.4 W 151.5 W 355 BTU/h 515.2 BTU/h
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
116.4 W 192.2 W 395.8 BTU/h 653.5 BTU/h
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
113.9 W 208.9 W 387.3 BTU/h 710.3 BTU/h
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
125.5 W 215.7 W 426.7 BTU/h 733.4 BTU/h

 Notes

  1. Power consumption data (watts) is measured from the wall power source and includes all power supply and system losses. Additional correction is not 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 will require faster fan speeds which will increase power consumption. At 35° C (95° F), 50 W should be added to reflect increased power consumption.
  4. Available for education institutions only.

*Information not available.

Last Modified: Jul 9, 2014
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  • Last Modified: Jul 9, 2014
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