I apologize if my topic is covered in another thread, I checked and didn't find one. I believe my graphics card is going on my mid-2011 iMac. I am beginning to see occasional pixelation. I have decided once it goes to replace my iMac by using my 2015 MacBook Pro with an external monitor. My question is can anyone give me a possible time frame for when the card will finally die. I am curious how long I have to decide on a replacement monitor. Thanks!