Amazon.com: SABRENT 4-Port USB 3.0 Hub for iMac Slim Uni-Body (HB-IMCU) : Everything Else
USB 3 + Wifi ac + BT4.2 for iMac 27" mid 2010 | MacRumors Forums
Identify your iMac model - Apple Support
USB 3.0 for iMac mid 2011 | MacRumors Forums
USB 3.0 for iMac mid 2011 | MacRumors Forums
Adding USB3.0 to late 2009 iMac (11,1) | MacRumors Forums
iMac Intel 21.5" and 27" (Mid 2011) SSD Upgrade Bundle - iFixit Store
iMac (27-inch, Mid 2011) - Technical Specifications
The 27-inch Apple iMac Review (2011)
USB 3.0 for iMac mid 2011 | MacRumors Forums
4-Port USB 3.0 Hub For iMac - Sabrent
Amazon.com: SABRENT Premium 3 Port Aluminum USB 3.0 Hub with Multi-in-1 Card Reader (12" Cable) for iMac, All MacBooks, Mac Mini, or Any PC (HB-MACR) : Everything Else
Identify your iMac model - Apple Support
Adding USB3.0 to late 2009 iMac (11,1) | MacRumors Forums
Take a tour: 21.5-inch iMac and 27-inch iMac - Apple Support
USB 3.0 for iMac mid 2011 | MacRumors Forums
USB 3.0 for iMac mid 2011 | MacRumors Forums
USB 3.0 for iMac mid 2011 | MacRumors Forums
Adding USB3.0 to late 2009 iMac (11,1) | MacRumors Forums
Adding USB3.0 to late 2009 iMac (11,1) | MacRumors Forums
Upgrading my old iMac 2011 | Miss Misfit
![Anker 4-Port USB 3.0 Hub, Ultra-Slim Data USB Hub with 2 ft Extended Cable [Charging Not Supported], for MacBook, Mac Pro, Mac mini, iMac, Surface Pro, XPS, PC, Flash Drive, Mobile HDD :](https://m.media-amazon.com/images/I/51FKV5A5L0L._AC_SL1103_.jpg "Anker 4-Port USB 3.0 Hub, Ultra-Slim Data USB Hub with 2 ft Extended Cable [Charging Not Supported], for MacBook, Mac Pro, Mac mini, iMac, Surface Pro, XPS, PC, Flash Drive, Mobile HDD :")