Juicy Crumb - 2011 27" iMac Upgrade Logic Board by Juicy Crumb Systems — Kickstarter
USB 3.0 for iMac mid 2011 | MacRumors Forums
21.5- and 27-inch iMacs (Mid 2011) | Macworld
Is it possible to extend a late 2013 iMac to an external display? - Quora
Amazon.com: Mini DisplayPort to HDMI Adapter for iMac Mid 2011(27-inch, 21.5 inches) Mini DP to HDMI Adapter Compatible with MacBook Air/Pro, Microsoft Surface Pro/Dock, Projector and More 1-Pack : Electronics