Apple iMac 21.5" i5 Quad Core 2.5GHz 8GB 500GB HD 6750 Graphics A1311 – WJMTech
Used Apple Thunderbolt Display 27. - Apple Computer MC914LL/A - GainSaver
The Apple Thunderbolt Display Review
How to connect Thunderbolt 1 to iMac late 2013 - Quora
A New Thunderbolt Implementation - The 2011 MacBook Air (11 & 13-inch): Thoroughly Reviewed
How To Use an iMac as a Monitor for a PC
i5 LED iMac (21.5-inch, Mid 2011)
Looking to connect a mid 2011 iMac to an external monitor, these are my connections available. What are my options? : r/applehelp
Apple says it's vintage. It's a 21.5 in 2011 iMac w/ 32GB ram, 4GB AMD wx4150, 512GB and 1TB internal SSDs on a 2nd primary 2011 Thunderbolt Display running Ubuntu. Playing some
Compared: Apple Studio Display vs. 2011 Thunderbolt Display - Current Mac Hardware Discussions on AppleInsider Forums