Amazon.com: 2GB Graphics Video Card Replacement for Apple iMac Mid-2011 27 Inch A1312 Core i7 3.4 MD063LL/A MD063 Desktop PC Computer, ATI Radeon HD 6970 GDDR5 2 GB, New GPU Upgrade Repair
Flashing the BIOS to Fix a "Bricked" Lenovo Laptop - Parts Not Included
Second GPU not detected on computer? Here's 3 steps to fix it