Antwoord op "Upgrade the Graphics card on MacBook Pro 15" Unibody Late 2011"Keep in mind this is an outdated graphics chip that can’t do Metal and will only allow OS X up to High Sierra. Do you really want to keep throwing money at an 8 year old computer? However, if it meets your needs, go for it. There are postings at other sites that show you a Terminal command that disables the problem AMD chip and then only the built-in but less capable Intel graphics chip is used - but the AMD problems go away. I also found a YouTube that says the underlying problem is NOT the graphics chip and solder joints, etc but a near-by capacitor on the logic board that eventually fails from over-heating - he walks you through replacing it with a sturdier capacitor and demonstrates how it fixes the problems - this same brand capacitor is also the cause of similar problems on other MacBooks falsely ascribed to the graphics chip.