Indeed.  After 5 years the original GPU developed some kind of intermittent flaw so I swapped it out with the board (and cooler) from a mid-2010 iMac.  It&#x27;s an easy swap.  Mac OS X identifies it as a Radeon 5750 but Windows calls it a 5850.  Either way, I believe it&#x27;s very similar in performance to the original 4850 that was the top spec in the late-2009 iMac.