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Now, on the MBP 11,4 with a single-GPU which replaced the former (I always try to have a MBP with 3year AppleCare) I plug in the three screens but only 2 work !!! One is standing useless on the desk, I would need to use matrox cards which do not support individual spaces. I had before a MBP 10,1 with dual video card: just plugged in the HDMI, and the two thunderbolt-DVI adapters, worked perfectly. Not only for programming visuals - to ensure a spacial immersion I use 3 projectors (used that on class about art history to give pupils the sensation of being surrounded by questions) - but even to write academic articles: I put them in 90°, on one is the raw text I am writing, on the other the LaTeX output (for example with TexPad), on the other some reference texts, and on the mac screen the mindmap. I work with 3 monitors home, besides of the main one. I saw the difference, and it was very frustrating. I didn't expect that, I apologize for the false info. I had a dualGPU MBP working with a set of 3 screens, I wrote the post before plugging the new single MBP to it, and realizing it does not work. IT IS WRONG, it is FALSE I can use 3 screens with a single boarded computer. But it is expensive, so test and consider if you really need it. If you are a power gamer, then maybe you will start to search for something to control 3D on 4k, in that case I would recommend you to acquire an external video card and box = Thunderbolt PCIe Video box. This why I think that, as normal user, you will hardly notice a difference between a double GPU and a single. And it gives a lot, I have 3 screens on daily basis connected directly (HDMI and both thunderbolt ports), etc. I usually worked (due to mobility) with a double GPU MacBookPro, but nowadays I have a single card Lap. I am since quite a while I guess a power user, with video editing, realtime image recognition and generation, programming directly for the GPU. Thats why I tell you that your video card is quite strong, and will fulfill, I guess, most of your needs. I guess you are new to the mac world, because of the question of upgrading a retina. Hi, I guess this is outdated, but anyway: congrats for the christmas gift.