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Now that it's stripped of all accoutrements, we can ID this logic board's silicon:
Intel LGA 1151 CPU socket
AMD Radeon Pro 555 GPU
SK hynix H5GC4H24AJR-ROC 4 Gb GDDR5 2400 MHz SDRAM (4 Gb × 4 for a total of 2 GB VRAM)
Broadcom BCM5776 Gigabit Ethernet Controller (as seen in the 2015 iMac revisions)
Texas Instruments CD3215C00 (also seen recently in the 15" MacBook Pro)
Intel SR2C9 platform controller hub
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