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Rectangular silver metal power supply unit with label OT8043 614-0444 visible

Delta P

Delta P 145 W Power Supply OT8043 614-0444 for 21.5" A1311

SKU CH-R8EB-MBA45

Replacement 145 W power supply for 21.5" A1311 systems including MB950, MC309, MC413, MC508 and MC509 models

  • Max wattage145 W
  • Modular cablingNo
  • Fan configuration0
  • Delivers stable 12.1 V output with 17.1 A on the main rail
  • Fanless design ensures silent operation in 21.5" A1311 systems
  • 145 W maximum power meets demands of MB950 MC309 MC413 MC508 MC509
  • Universal 100-240 V input works worldwide without a voltage switch
  • Zero fans reduce dust intake and moving-part wear over time

145 W Internal Power Supply

This 145 W Delta P unit is a direct replacement for the original power supply in 21.5 inch A1311 systems. It accepts a 100 to 240 V input and delivers 12.1 V across two rails rated at 5.0 A and 17.1 A. The fanless design operates silently inside compatible all-in-one chassis.

Suits A1311 MB950 MC309 MC413 MC508 MC509 owners

Technicians restoring the listed board models will find the correct connector layout and voltage rails. Buyers needing higher wattage or modular cables for a custom build should look at other form factors. Units pulled from working machines show about 90 percent cosmetic condition.

145 W maximum power rating

The 145 W continuous rating is the single figure that determines whether this supply can sustain your A1311 workload. Verify your original unit matches the OT8043 614-0444 part number and the 12 V rail currents before ordering.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $29.99
Cheaper than about 95% of the 10,869 comparable items (median $142.99).
Max wattage 145 W
Lower than about 99% of the 930 comparable items (median 850 W).

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Specifications

Power
Max wattage145 W
Modular cablingNo
More details
Fan configuration0

Questions about this item

How much heat does the 145 W unit add to a closed chassis when it runs continuously?

With zero fans the supply relies on passive convection, so all 145 W of waste heat stays inside the case unless the system provides its own airflow.

Which proprietary connector does the 21.5" A1311 logic board expect from this supply?

The unit ships with the Apple-specific plug used on MB950, MC309, MC413, MC508 and MC509 boards; no standard ATX connector is present.

Will the 12 V rails on this supply match the voltage tolerance of the original 205 W brick?

Both 12 V outputs are rated at 12.1 V, matching the original specification for the listed iMac models.

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