iMac features an ultrathin all-in-one design, beautiful widescreen display, the latest processors and graphics, and advanced storage options.
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Apple currently has no plans to release a larger-screen iMac - 9to5Mac
iMac (Retina 5K, 27-inch, Late 2014) - Technical Specifications
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Apple iMac with Retina 5K display review - The Verge