The XPS 15 9570 with i7-8750H CPU is almost twice as fast as its predecessor
The performance of Coffee Lake-H is more or less a known quantity at this point as we began our performance comparisons and coverage of Intel's new hexa-core mobile CPUs over two months ago. However, Intel's more recent chips have been designed with higher turbo speeds yet lower base clocks for marketing and scalability purposes. The result is that the performance of a given system is no longer so closely predicted by the specifications of its components but instead the engineering and implementation of them.
Given that the XPS 15 9550 and 9560 both exhibited throttling in our stress tests and the i7-8750H is known to draw over 75W under load (nearly double that of the i7-7700HQ), our expectations of sustained performance in such a thin chassis as the XPS 15's were tempered from the beginning. Our Cinebench R15 64-bit multi loop test repeatedly runs the 64-bit multi benchmark over and over, and this is usually enough to bring many thin-and-light machines to their knees. The XPS 15 9560 with Core i7-7700HQ CPU saw a 9 percent decrease in performance over 20 runs of Cinebench, finally settling with a sustained performance of around 670 points. The XPS 15 9570 with i5-8300H outperformed last year's 9560 with higher-tier i7 with a consistent 815 points on the loop, which suggests improvements either in the efficiency of the chip or tweaks to the cooling system with this year's revision. The i7-8750H-equipped XPS 15 did see a similar 8 percent performance drop over time as the 9560 with i7-7700HQ, but the raw performance increase over its predecessor was impressive: The XPS 15 9570 with i7-8750H started at 1170 and settled at 1070 points, whereas the XPS 15 9560 started at 735 and ended at 669. Even after extended CPU benchmarking loads, the new XPS 15 with i7 outperformed the old by an incredible 60 percent.
A comparison chart of our Cinebench loop data can be found below. Stay tuned in the coming weeks for our full review of the i7 configuration of the XPS 15 9750.