Apple A1419 iMac 27 Retina 5K Series Intel Socket LGA1151 AMD Radeon Pro 580 8GB GDDR5 All-In-One Desktop Motherboard 661-03382.
Socket: Intel LGA1151
Max Supported Memory: 64GB
Number of Memory Slots: 4
Memory Type: DDR4 SDRAM
Video Chipset/GPU Model: AMD Radeon Pro 580
Graphics Memory: 8GB GDDR5
Type: All-In-One Desktop Motherboard