This is the 21.5" iMac logic board for the late 2013 model only. This is the first generation of iMac that used the Haswell range of processors. This Logic board has a 2.9GHz Intel Quad Core i5 processor. There are two ram slots on the rear of the logic board which can take up to 16GB of PC3-12800 (1600MHz) DDR3 SO-DIMM modules. (Non-user accessible.) This logic board has an integrated graphics card, NVIDIA GeForce GT 750M with 1GB of dedicated GDDR5 VRAM. This logic board has an 5.0 GT/s PCIe x2 port located on the rear of the logic board for a single modular SSD, which can be used in a fusion drive setup or as a standalone SSD.
(Image for reference only)