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2015 27″ iMac 5K (R9 M390) [6th,4C] + Radeon VII @ 16Gbps-TB2>TB3 (Razer Core X) + macOS 10.15.2 [Koncept_Zero] | External GPU Builds
![Original For Apple iMac 27" A1312 VGA Card GPU 216-0732019 Video Card Graphic Card 109-B90957-00 HD4850 512MB full tested - AliExpress Original For Apple iMac 27" A1312 VGA Card GPU 216-0732019 Video Card Graphic Card 109-B90957-00 HD4850 512MB full tested - AliExpress](https://ae01.alicdn.com/kf/HTB1cdGiIpXXXXc.XXXXq6xXFXXXa/Original-For-Apple-iMac-27-A1312-VGA-Card-GPU-216-0732019-Video-Card-Graphic-Card-109.jpg)
Original For Apple iMac 27" A1312 VGA Card GPU 216-0732019 Video Card Graphic Card 109-B90957-00 HD4850 512MB full tested - AliExpress
SOLVED: Is this the right logic board for late 2015 iMac 27” - iMac Intel 27" Retina 5k Display - iFixit
![Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET](https://www.cnet.com/a/img/resize/c4cfb8553a1fe167bf1dcab91ede8365229ae603/hub/2015/10/09/54f1edc6-361b-4d74-be8f-b80c9272e8f2/apple-imac-with-4k-retina-display-21-5-inch-2015-22.jpg?auto=webp&fit=crop&height=900&width=1200)