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4 monitors side by side.

6 h a day
  • Electricity at €0.2832 per kWh (household price with taxes, Eurostat 2026-S1).
  • 210 g CO₂e per kWh generated in 2023 (European Environment Agency). Counts use only, not manufacturing.

Electricity prices in all EU countries

Yearly running cost

Bars in proportion to the energy each model uses.

  • iiyama XCB3494WQSN-B5 A €19.35
  • AOC CU34E4CW €12.40
  • ASUS VU34WCIP-W €15.07
  • MSI PRO MP341CQPHG E12 €15.51
Model iiyama XCB3494WQSN-B5 A AOC CU34E4CW ASUS VU34WCIP-W MSI PRO MP341CQPHG E12
Running cost
Running cost (per year) €19.35 €12.40 €15.07 €15.51
over 10 years €194 +€69 over 10 years €124 €151 +€27 over 10 years €155 +€31 over 10 years
kWh per year 68.3 43.8 53.2 54.8
kg CO₂e per year from electricity use 14 9.2 11 11
Specifications
Brand iiyama AOC ASUS MSI
Model XCB3494WQSN-B5 A CU34E4CW VU34WCIP-W PRO MP341CQPHG E12
Energy class F D E E
Screen size 34″ (86.4 cm) 34″ (86.4 cm) 34″ (86.4 cm) 34″ (86.4 cm)
Power in on mode (SDR) 31.2 W 20 W 24.3 W 25 W
Energy class (HDR) G G G G
Power in on mode (HDR) 53.2 W 46 W 34.7 W 40 W
Standby 0.4 W 0.5 W 0.5 W 0.5 W
Networked standby 0.9 W 2 W – –
Off mode 0.3 W 0.3 W 0.3 W 0.3 W
Resolution 3440 × 1440 3440 × 1440 3440 × 1440 3440 × 1440
Aspect ratio 21:9 21:9 21:9 21:9
Panel LED LCD LED LCD LED LCD LCD
Refresh rate 60 Hz 60 Hz 60 Hz 60 Hz
Power supply Internal Internal External Internal
Guaranteed support 7 years 8 years 7 years 3 years
Software updates 8 years 8 years 8 years 8 years
Spare parts available 7 years 7 years 7 years 3 years
On the market since April 1, 2024 October 15, 2025 January 6, 2025 April 20, 2026
EPREL registration number 1952408 2418682 2205883 2664456

Rows where the models differ are highlighted.