Apple iMac 27" i5 3.1 Radeon 6970M 1GB (Mid 2011) - Technical data and benchmarks
Apple iMac "Core i5" 2.7 21.5-Inch (Mid-2011) - Imagine41
Amazon.com: Valley Of The Sun 2GB Graphics Video Card Upgrade for Apple iMac Mid-2011 27 Inch Core i5 MC814LL/A MC814 A1312 Desktop All-in-One PC, AMD Mobility Radeon HD 6970M Replacement Repair Parts :