We offer used mainboard / logic board for the iMac 21.5" A1418 from 2015 (2k model). The logic board setup is with:

- 2.8 i5 Quad core CPU 
- 8 GB RAM
- Intel Iris Pro 6200 1536mb GPU
- NO NVME SLOT, so only ssd/hd using SATA cable.

Details:

Apple Parts number: 820-00431-A
A1418 - 21.5" - 2015 - 2k lcd model

Correctly working. We also have parts for other models.