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M2014 rMBP 15" = 'mid 2014' Retina MacBook Pro 15-inch Intel 2.8GHz Core i7-4980HQ CPU, 16GB 1600MHz DD3L SDRAM, NVIDIA GeForce GT 750M Discrete GPU, Intel Iris Pro Integrated GPU, 1TB PCIe-based Flash Storage (x4 Link Width) M2015 rMBP 15" = 'mid 2015' Retina MacBook Pro 15-inch Intel 2.8GHz Core i7-4980HQ CPU, 16GB 1600MHz DD3L SDRAM, AMD Radeon R9 M370X Discrete GPU, Intel Iris Pro Integrated GPU, 1TB PCIe-based Flash Storage (x4 Link Width) There are a two significant performance enhancements in the 'mid 2015' MacBook Pro Retina with 15.4-inch display: STORAGE and GPU.
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