How to Upgrade 2011 iMac Graphics Card Step 1: Taking Off the Screen Plus, the chipset has already support from 10.8.3 onwards. Personally, I think I would like to recommend this one because it’s very affordable ( $14 on eBay). In this article, I will be attempting to upgrade from the factory 6770m to an NVidia K610m in my 2011 27-inch iMac. The above graphics cards also support brightness control as well as boot screens via VBIOS flash.
