iMac power consumption and thermal output

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

iMac (24-inch, 2024, Two ports)

23.5-inch Retina 4.5K display, M4 8-Core CPU & 8-Core GPU, 16 GB unified memory, 256 GB SSD

Power Consumption

Thermal Output

Idle

CPU Max

Idle

CPU Max

43W

100W

147 BTU/h

341 BTU/h

iMac (24-inch, 2024, Four ports)

23.5-inch Retina 4.5K display, M4 10-Core CPU & 10-Core GPU, 32 GB unified memory, 2 TB SSD

Power Consumption

Thermal Output

Idle

CPU Max

Idle

CPU Max

46W

105W

157 BTU/h

358 BTU/h

iMac (24-inch, 2023, Two ports)

23.5-inch Retina 4.5K display, M3 8-Core CPU & 8-Core GPU, 8 GB unified memory, 256 GB SSD

Power Consumption

Thermal Output

Idle

CPU Max

Idle

CPU Max

40W

70W

136 BTU/h

239 BTU/h

iMac (24-inch, 2023, Four ports)

23.5-inch Retina 4.5K display, M3 8-Core CPU & 10-Core GPU, 24 GB unified memory, 2 TB SSD

Power Consumption

Thermal Output

Idle

CPU Max

Idle

CPU Max

43W

85W

147 BTU/h

290 BTU/h

iMac (24-inch, M1, 2021)

23.5-inch Retina 4.5K display, M1 8-Core CPU and 7-Core GPU, 16 GB unified memory, 1 TB SSD

Power Consumption

Thermal Output

Idle

CPU Max

Idle

CPU Max

43W

80W

147 BTU/h

274 BTU/h

iMac (24-inch, M1, 2021)

23.5-inch Retina 4.5K display, M1 8-Core CPU and 8-Core GPU, 16 GB unified memory, 2 TB SSD

Power Consumption

Thermal Output

Idle

CPU Max

Idle

CPU Max

43W

84W

147 BTU/h

286 BTU/h

iMac (Retina 5K, 27-inch, 2020)

27-inch Retina 5K display, 3.6 GHz 10-Core i9, 128 GB 2666 MHz DDR4 SDRAM, 8 TB Solid State Drive, AMD Radeon Pro 5700 XT with 16 GB memory

Power Consumption

Thermal Output

Idle

CPU Max

Idle

CPU Max

74W

295W

252 BTU/h

1007 BTU/h

iMac (Retina 5K, 27-inch, 2019)

27-inch Retina 5K display, 3.6 GHz Intel 8-Core i9, 64 GB 2666 MHz DDR4 SDRAM, 3 TB Fusion Drive, AMD Radeon Pro Vega 48 with 8 GB memory

Power Consumption

Thermal Output

Idle

CPU Max

Idle

CPU Max

71W

262W

242 BTU/h

895 BTU/h

iMac (Retina 4K, 21.5-inch, 2019)

21.5-inch Retina 4K display, 3.2G Hz Intel 6-Core i7, 32 GB 2666 MHz DDR4 SDRAM, 1 TB Solid State Drive, AMD Radeon Pro Vega 20 with 4 GB memory

Power Consumption

Thermal Output

Idle

CPU Max

Idle

CPU Max

47W

166W

161 BTU/h

568 BTU/h

iMac (Retina 5K, 27-inch, 2017)

27-inch Retina 5K display, 4.2 GHz Intel Quad-Core i7, 64 GB 2400 MHz DDR4 SDRAM, 3 TB Fusion Drive, AMD Radeon Pro 580 with 8192 MB 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, 3.6 GHz Intel Quad-Core i7, 32 GB 2400 MHz DDR4 SDRAM, 512 GB Solid State Drive, AMD Radeon Pro 560 with 4096 MB 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, 2.3 GHz Intel Dual-Core i5, 16 GB 2400 MHz DDR4 SDRAM, 256 GB 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, 4.0 GHz Intel quad-core Core i7, 32 GB 1866 MHz DDR3L SDRAM, 3 TB Fusion Drive, AMD Radeon R9 M390 with 2 GB 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, 3.3 GHz Intel quad-core Core i7, 16 GB 1866 MHz LPDDR3 SDRAM, 2 TB 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, 1.6 GHz Intel dual-core Core i5, 16 GB 1866 MHz LPDDR3 SDRAM, 1 TB 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, 3.3 GHz Intel Core i5, 32 GB 1600 MHz DDR3 SDRAM, 3 TB 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 (Retina 5K, 27-inch, Late 2014)

27-inch display, 4 GHz Intel Core i7, 32 GB 1600 MHz DDR3 SDRAM, 3 TB Fusion Drive, AMD Radeon R9 M295X with 4096 MB 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, 1.4 GHz Intel Core i5, 8 GB 1600 MHz DDR3 SDRAM, 500 GB HDD, integrated graphics

Power Consumption

Thermal Output

Idle

CPU Max

Idle

CPU Max

33W

68W

113 BTU/h

232 BTU/h

iMac (21.5-inch, Late 2013)

21.5-inch display, 3.1 GHz Intel Core i7, 16 GB 1600 MHz DDR3 SDRAM, 1 TB 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, 2.9 GHz Intel Core i5, 8 GB 1600 MHz DDR3 SDRAM, 1 TB 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, 2.7 GHz Intel Core i5, 8 GB 1600 MHz DDR3 SDRAM, 1 TB 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, 3.4 GHz Intel Core i7, 32 GB 1600 MHz DDR3 SDRAM, 3 TB 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, 3.4 GHz Intel Core i5, 8 GB 1600 MHz DDR3 SDRAM, 1 TB 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, 3.2 GHz Intel Core i5, 8 GB 1600 MHz DDR3 SDRAM, 1 TB 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, 3.1 GHz Intel Core i3, 2 GB 1333 MHz DDR3 SDRAM - 2x2 GB, 250 GB 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, 2.5 GHz Intel Core i5, 4 GB 1333 MHz DDR3 SDRAM - 2x2 GB, 500 GB 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, 2.7 GHz Intel Core i5, 4 GB 1333 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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, 2.7 GHz Intel Core i5, 4 GB 1333 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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, 3.1 GHz Intel Core i5, 4 GB 1333 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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, 3.4 GHz Intel Core i7, 4 GB 1333 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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 (21.5-inch, Mid 2010)

21.5-inch display, 3.6 GHz Intel Core i5, 4 GB 1333 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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, 3.2 GHz Intel Core i3, 4 GB 1333 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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, 3.6 GHz Intel Core i5, 4 GB 1333 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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, 3.33 GHz Intel Core 2 Duo, 4 GB 1066 MHz DDR3 SDRAM - 2x2 GB, 500 GB 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, 3.2 GHz Intel Core i3, 4 GB 1333 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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, 3.06 GHz Intel Core 2 Duo, 4 GB 1066 MHz DDR3 SDRAM – 2 x 2 GB, 1 TB 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, 3.33 GHz Intel Core 2 Duo, 4 GB 1066 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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, 2.66 GHz Quad-core Intel i5, 4 GB 1066 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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, 2.66 GHz Intel Core 2 Duo, 2 GB 1066 MHz DDR3 SDRAM - 2x1 GB, 320 GB 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, 2.66 GHz Intel Core 2 Duo, 4 GB 1066 MHz DDR3 SDRAM - 2x2 GB, 640 GB 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, 2.93 GHz Intel Core 2 Duo, 4 GB 1066 MHz DDR3 SDRAM - 2x2 GB, 640 GB 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, 3.06 GHz Intel Core 2 Duo, 4 GB 1066 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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, 3.06 GHz Intel Core 2 Duo, 4 GB 1066 MHz DDR3 SDRAM - 2x2 GB, 1 TB 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

* 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 is not needed.

  • CPU Max is defined as running a compute-intensive test application that maximises processor usage and therefore power consumption.

  • “Idle” reflects the power used with only Finder open, using the default power management settings.

  • These numbers reflect a 23°C (73.4°F) ambient running environment. Increased ambient temperatures require faster fan speeds which increases power consumption.

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