Apple iMac 27" Mid 2010 A1312 Intel i5 2.8GHz 8GB Ram 1TB HDD MacOS High Sierra 885909390038 | eBay
Incase anyone ever needs the answer…I have a 27” 2010 iMac working in Target Display Mode with a M1 MacBook Pro using a miniDP to USB C adaptor that's capable of 4k60Hz.
3d apple imac 27 2010
Installing additional SSD in Mid-2010 27" iMac
Apple iMac 21.5″ Mid 2010 Core i3 3.06GHz 12GB 500GB DVD-RW WiFi macOS 10.13 High Sierra – Refresh Computers Online Marketplace