Some background: I have a 2011 27" iMac w/ Intel Quad Core i7 3.4Ghz (Sandy Bridge), 16GB Ram 1 TB Hard Drive and AMD Radeon 6970M w/ 2GB VRAM. I am a graphic designer who uses the Adobe Creative Suite a lot, Photoshop, InDesign and Illustrator. I also game on occasion. The following questions are to determine if I should upgrade my 2011 27" iMac to the new Retina iMac. I am unfamiliar with the way Intel classifies their processors and clock speeds so bear with me. I am also unfamiliar with AMD video cards and how VRAM factors in, all i know, is more is usually better. Question 1: My existing iMac has an Intel Quad Core i7 with a 3.4GHZ clock speed. Since I was thinking of purchasing the new Retina iMac, it has the Haswell Quad Core i5 with a 3.5GHZ clock speed. On paper it seems like a minor jump in clock speed, can someone explain, is it a much faster processor, will I see a massive jump in CPU power? Question 2: I currently have the AMD Radeon 6970M w/ 2GB VRAM in my iMac, would an upgrade to AMD Radeon R9 M290X with 2GB VRAM, be much of an improvement? Would I need to double the VRAM to 4GB to really notice a difference? Help Me!