Intel iMac 27" AMD Radeon 6770M 512MB Video Card, Mid 2011 DIY Parts replacement Video Cards
AMD Radeon HD 6770M Video Card 1 GB | HP 216-0810001 Not Apple Brand | eBay
AMD Radeon HD 6770M Mac Edition Specs | TechPowerUp GPU Database
AS-IS Apple iMac 27" A1312 Mid 2011 - Video Card AMD Radeon HD 6770M 512MB | eBay
Amazon.com: Original Graphics Video Card for Apple iMac 2011 Core i5 2.7 A1312 MC813LL/A MC813 27 Inch Desktop PC Computer AMD Radeon HD 6770M HD6770M GDDR5 512MB 109-C29557-00 Replacement Parts : Electronics
iMac A1312 27" Mid 2011 Video Card AMD Radeon HD 6770M 512MB MXM 661-5967 AS-IS
655488-001 659095-001 For HP Pavilion DV7-6000 DV7T-6000 Laptop Motherboard HM65 HD 6770M/6770M GPU DDR3 100% Fully Tested - AliExpress
661-5967 for imac A1312 27" Mid 2011 MC813LL/A MC814LL/A Video Card AMD Radeon HD 6770M 512MB - AliExpress