I'm in the final stages of deciding on either a mid-2014 or a mid-2015 Retina MBP. I have a couple of CPU/GPU performance questions: I frequently have 50-70 Safari tabs open, but I don't game or use Final Cut, or anything like that. My current (late-2014) Mac mini only has a dual-core and Iris 5100 graphics, and it's a bit slow keeping up. Considering how I'm using the computer, would I benefit from the faster GDDR5 memory of a dedicated graphics card? (the AMD in the case of a mid-2015 and the NVIDIA 750M if I got the mid-2014) or is the CPU mostly responsible for Safari-related performance?? The CPU is virtually identical in those two machines, and I would gain some by getting the Iris Pro 5200 with the eDRAM. (over what I have now in the Iris 5100) I'm hoping I will see MUCH faster performance thanks to the quad-core and the PCIe 3.0 x4 SSD. If you had the choice between a mid-2014 MBP WITH the NVIDIA 750M but the slower PCIe SSD (to the extent that a PCIe SSD is "slow"), and a mid-2015 WITHOUT a GPU but with the much faster SSD, which one would you go for??? Decisions, decisions! I can't wait to get one of these babies! Thanks to all who respond!