We had our doubts on the performance of the Surface Pro 4 Core i7 configuration considering the throttling issues found on the Surface Pro 3. Luckily, we can observe no major performance issues when under high loads. The tablet is able to maintain its maximum Turbo Boost of 3.2 GHz for both cores when under Prime95 stress and Unigine Heaven stress. The integrated GPU operates at a very steady 950 MHz under similar conditions. Throttling will occur when running both Prime95 and FurMark simultaneously.

Note that the AC adapter is unable to provide enough power to the tablet to maintain such high processing loads. Thus, the tablet will surely but slowly drain battery power even when connected to mains.

Running on battery power only will cause a very slight dip to CPU and GPU performance. A 3DMark 11 run on batteries returns CPU and GPU scores of 2370 and 4761 points, respectively, compared to 2450 and 4919 points when on mains.