Apple iMac 27" 2010 A1312 Intel i3 4 GB RAM 1 TB HDD Radeon HD 5670 macOS 10.13
July 2010 27" Core i5 2.8GHz Quad Core iMac Unboxing (4GB RAM / 1TB HD / ATI 5750) - YouTube
Identify your iMac model - Apple Support
Apple iMac 27" Mid 2010 Core i5 2.8GHz 16GB RAM 1TB HDD Radeon HD 5750 CHIPPED | 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.
iMac 21.5 Inch 3.06GHz Intel Core i3 Mid-2010 MC508LL/A
Apple iMac 27-inch (July 2010) review: Apple iMac 27-inch (July 2010) - CNET
Working Apple iMac 21.5" 21.5 INCH MID 2010 i5 3.6ghz 2TB HDD 8gb Computer | eBay