That's due to its having only the Intel integrated GPU. The 13' Retina MacBook Pro lags behind in all but one graphics test. However, the re-engineered keyboard with butterfly mechanism remains a 12' MacBook exclusive. Yet in some tests not yet published, we saw only a 5% gain.Д«esides storage and graphics, a notable new feature is the Force Touch trackpad with Taptic Engine. In the graphics intensive tests featured here, the new Radeon R9 M370X GPU was as much 62% faster than the GeForce GT 750M it replaces. (NOTE: The 256G version has a slower large sequential write speed of 1198MB/s.) It is faster than any single flash module we have tested to date. The new 15-inch MacBook Pro's PCIe-based Flash Storage is a screamer. RED bar in graph indicates the FASTEST result. L2013 rMBP 15' = 'late 2013' Retina MacBook Pro 15-inch with Intel 2.6 Quad-Core i7-4960HQ CPU, 16GB 1600MHz DD3L SDRAM, NVIDIA GeForce GT 750M Discrete GPU, Intel Iris Pro Integrated GPU, 512GB PCIe-based Flash Storage (x2 Link Width)Д®2015 rMBP 13' = 'early 2015' Retina MacBook Pro 13-inch with Intel 3.1GHz Dual-Core i7-5557U processor, 16GB 1866MHz LPDDR3 SDRAM, Intel Iris Graphics 6100 Integrated GPU, 512GB PCIe-based Flash Storage (x4 Link Width) 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.

2015 macbook pro 15 inch