Genuine Apple Logic Board with NVIDIA GeForce GTX 755M graphics processor with 1 GB of memory.

This logic board was used in the base configuration of the Late 2013 27" iMac.  It may be used as replacement for other Late 2013 models where a step down in GPU performance is acceptable. 

No CPU is included with this Logic Board it may be used with any of the following Haswell 4th Generation Intel Core Series Processors.  

3.2 GHz I5-4570

3.4 GHz I5-4670

3.5 GHz I7-4771

Compatibility

27 inch Apple iMac (Thin) Late 2013 

Identifiers

iMac 14,2 A1419 - 2639

Model Numbers

ME088LL/A

ME089LL/A

MF125LL/A 

Specs

Processor

Socket FCLGA1150 

• 3.2GHz
  3.2GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache
• 3.4GHz
  3.4GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.8GHz) with 6MB L3 cache
• 3.5GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.9GHz) with 8MB L3 cache

Memory

• 1600MHz DDR3 memory; four user-accessible SO-DIMM slots
  Configurable to 16GB or 32GB.

Graphics

• NVIDIA GeForce GTX 755MX graphics processor with 1 GB of GDDR5 memory.

Video Support and Camera

• Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display
• Support for extended desktop and video mirroring mode.

Connections and Expansion

• SDXC card slot
• Four USB 3 ports (compatible with USB 2)
• Two Thunderbolt 2 ports up to 20 Gb/s
• 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)