Apple has updated the iMac with fourth-generation Intel Haswell quad-core processors and improved graphics. We've got all of the specifications of the new iMac, and also give you a peek inside the new models. The entry-level iMac gains Intel's new Iris Pro integrated graphics. This series of graphics processors are said to offer Intel’s highest graphics capabilities, and Apple claims they will allow for unprecedented levels of integrated graphics performance. Previously the entry level model featured the NVIDIA GeForce GT 640M (as did the high-end 21.5-inch model). The entry-level iMac is the only one to this integrated graphics processor, while the three other models will offer NVIDIA GeForce GT 750M and 755M graphics. The NVIDIA GeForce 700 series graphics offer twice the video memory and up to 40 percent faster performance than the pre
