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Apple iMac (M6, four ports)

Ranked #12 of 41 in Most energy-efficient all-in-one PCs, ranked on official ENERGY STAR power figures. Here is every spec we scored, where it came from, and how it compares.

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A

#12

Apple iMac (M6, four ports)

Best for: Official TEC 57.4 kWh, official sleep 0.8 W

5.3/10

What we like

Official ENERGY STAR record lists a TEC of 57.4 kWh.
Official ENERGY STAR record lists sleep-mode power of 0.8 W.

Watch out for

Official TEC is a certified laboratory annual-energy figure for this configuration, not a utility bill we measured.

Score breakdown

Official TEC 45%

Official sleep power 30%

Official short-idle power 25%

Official TEC	57.4 kWh
Official sleep power	0.8 W
Official short-idle power	20 W
Official ENERGY STAR unique ID	4,723,574
Official model name	iMac (M6, four ports)
Official model number	A3590
Official product type	Integrated Desktop
Official TEC	57.4 kWh
Official sleep mode power	0.8 W
Official short-idle power	20 W
Official long-idle power	1.8 W
Official off-mode power	0.3 W
Official system memory	32 GB
Official CPU cores	12
Official processor brand	Apple
Official processor name	Apple M6
Official CPU base clock	4.5 GHz
Official storage technology	SSD
Official ENERGY STAR date certified	2026-10-14T00:00:00.000
Official integrated display size	23.5 in
Official integrated display resolution	11.29 MP
Official touch screen	No
Official external power supply rating	143 W
Price	Check price

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Specs sources:

How it compares

Open the full comparison table

HP 21.45 inch All-in-One Desktop PC 22-dg

#1 · Official TEC 34.9 kWh, official sleep 1.4 W

Lenovo ThinkCentre neo 55a 24 Gen 6

#2 · Official TEC 38.8 kWh, official sleep 0.9 W

Lenovo IdeaCentre AIO 24AKP10

#3 · Official TEC 44.3 kWh, official sleep 1 W

Lenovo IdeaCentre AIO 27AKP10

#4 · Official TEC 44.3 kWh, official sleep 0.8 W

HP OmniStudio 23.8 inch All-in-One Desktop PC 24-cv

#5 · Official TEC 44.1 kWh, official sleep 1.9 W

Apple iMac (M6, two ports)

#6 · Official TEC 53.5 kWh, official sleep 0.4 W

Lenovo ThinkCentre neo 50a 24 Gen 5

#7 · Official TEC 51.5 kWh, official sleep 1.5 W

Lenovo IdeaCentre AIO 27ILL11

#8 · Official TEC 49.1 kWh, official sleep 2.1 W

Lenovo ThinkCentre neo 50a 27 Gen 6 LNL

#9 · Official TEC 49.1 kWh, official sleep 2.1 W

Apple iMac (M4, two ports)

#10 · Official TEC 57.7 kWh, official sleep 0.6 W

HP OmniStudio 23.8 inch All-in-One Desktop PC 24-cu

#11 · Official TEC 48.9 kWh, official sleep 2.2 W

Lenovo ThinkCentre neo 50a 24 Gen 7

#13 · Official TEC 49.3 kWh, official sleep 2.7 W

Lenovo ThinkCentre neo 50a 27 Gen 7

#14 · Official TEC 49.9 kWh, official sleep 2.7 W

Lenovo ThinkCentre neo 50a 27 Gen 5

#15 · Official TEC 56.3 kWh, official sleep 1.6 W

Dell 24 All-in-One EC24260

#16 · Official TEC 52.3 kWh, official sleep 2.6 W

HP ProOne 440 23.8 inch G9 All-in-One Desktop PC

#17 · Official TEC 55.6 kWh, official sleep 2.1 W

Lenovo Yoga AIO 27IPH11

#18 · Official TEC 56 kWh, official sleep 2.2 W

Apple iMac (M4, four ports)

#19 · Official TEC 63.6 kWh, official sleep 0.9 W

Lenovo IdeaCentre AIO 24ILL11

#20 · Official TEC 54 kWh, official sleep 3.1 W

Lenovo ThinkCentre neo 50a 24 Gen 6 LNL

#21 · Official TEC 54 kWh, official sleep 3.1 W

Lenovo IdeaCentre AIO 27IPH11

#22 · Official TEC 58.3 kWh, official sleep 2.4 W

HP OmniStudio 27 inch All-in-One Desktop PC 27-cu

#23 · Official TEC 59.6 kWh, official sleep 2.5 W

Lenovo ThinkCentre M90a Gen 5

#24 · Official TEC 62.1 kWh, official sleep 2.3 W

MSI PRO MAX 27TP Z 8MG

#25 · Official TEC 60.7 kWh, official sleep 2.5 W

Dell 27 All-in-One EC27260

#26 · Official TEC 60.1 kWh, official sleep 2.9 W

Lenovo ThinkCentre M70a Gen 6

#27 · Official TEC 63.3 kWh, official sleep 3.3 W

Lenovo ThinkCentre M90a Gen 6

#28 · Official TEC 77.5 kWh, official sleep 1.3 W

HP EliteOne 840 23.8 inch G9 All-in-One Desktop PC

#29 · Official TEC 63.5 kWh, official sleep 3.8 W

HP EliteStudio 8 All-in-One G1i 27 inch Desktop AI PC

#30 · Official TEC 72 kWh, official sleep 2.5 W

HP OmniStudio 27 inch All-in-One Desktop PC 27-cv

#31 · Official TEC 71 kWh, official sleep 3 W

Lenovo ThinkCentre M90a Pro Gen6

#32 · Official TEC 91.3 kWh, official sleep 1.3 W

HP ProStudio 4 All-in-One G1i 23.8 inch Desktop AI PC

#33 · Official TEC 67.6 kWh, official sleep 3.9 W

Lenovo ThinkCentre X AIO

#34 · Official TEC 81.4 kWh, official sleep 2.2 W

HP EliteOne 870 27 inch G9 All-in-One Desktop PC

#35 · Official TEC 77.2 kWh, official sleep 2.8 W

MSI Modern AM242TP 1M

#36 · Official TEC 68.7 kWh

MSI Modern AM272P 1M

#37 · Official TEC 68.7 kWh

HP OmniStudio X 31.5 inch All-in-One Desktop PC 32-c

#38 · Official TEC 81.1 kWh, official sleep 2.4 W

Lenovo Yoga AIO 32ILL10

#39 · Official TEC 90.3 kWh, official sleep 2.1 W

HP OmniStudio X 27 inch All-in-One Desktop PC 27-cs

#40 · Official TEC 81.6 kWh, official sleep 2.6 W

MSI Modern AM273Q AI 1UMG

#41 · Official TEC 92.4 kWh, official sleep 4 W