This video will show a process on how to replace and upgrade GPU on iMacs from 2009, 2010 and 2011. In this video, our GPU candidate will be a workstation card from Nvidia. This method should apply on any iMac from 2009 to 2011. However, this method might not work on 2009 iMacs that Core2Duo LGA 775 socket. Make sure it has one of intel core i3, i5 or i7 series. Minkos Macs Camden 5 Ferdinand Street NW1 8ES London Tel: 02081273730 Minkos Macs Lewisham 8 Manor Park Parade Lee High Road SE13 5PB London Tel: 02088521961 Minkos Macs Shoreditch 16 Spelman Street Shoreditch E1 5LQ London Tel: 02088088333 Open 7 days a Week Monday - Saturday 10am - 7pm Sunday 11am - 5pm Website http://www.minkosmacs.com/ Email Info@minkosmacs.com All computers sold are tested and have passed Apples official AST diagnostic tests, sold with warranty and our repair technician is Apple certified