The two main differences between the Core i5 and Core i7 are clock speed for turbo frequencies and the more powerful graphics with the Intel Iris Plus 640, both of which make the Core i7 well suited for power users. ... Surface Laptop Core i5 vs. Core i7. CategoryCore i5-7200UCore i7-7660U GraphicsIntel HD 620Intel Iris Plus 640 6 more rows Nov 29, 2018