This logic board includes an Intel 3.3GHz i7 (i7-5775R) processor, 16GB onboard memory and heatsink attached. Versions of this board exist with and without SSD connector, but this particular board does include the PCIe SSD connector for installation of Apple's proprietary blade SSDs. The Late 2015 iMac 21.5" was available with standard and Retina 4K LCD displays, but this board is only compatible with the Retina 4K display option.
661-02988 Logic Board 3.3 GHz (16GB) SSD for iMac 21.5-inch Late 2015 A1418 MK452LL/A, BTO/CTO This is a replacement logic board for the Late 2015 iMac 21.5" non-Retina models that come with a solid state drive.