Maybe the 4.5-watt SoC (TDP) manages much longer battery runtimes compared to "power-hungry" Core i5? If this is the case, how much performance do you have to sacrifice if you want longer runtimes? The Core i5 also affects the power consumption and the temperature development, so we will also cover these sections in this performance update. Obviously, the small price difference raises the question why should anyone choose the m3 configuration? The fanless m3 version entry-level model of the Surface Pro costs almost 1000 Euros (~$1065/128 GB, without Type Cover), while the i5-6300U version starts at 1030 Euros (~$1097/128 GB) without accessories. While the main review of the brand-new Surface Pro 4 has a closer look at the Core m3 version of the 12-inch device, we can now check the Core i5 model.
For the original German review, see here.