Products based on the three-chip Intel Kaby Lake-G processors are gradually “leaking” to the market. Presented at the January CES 2018 “2-in-1” show, the Dell XPS 15 with the 9575 index went on sale relatively recently, and in a limited amount – in part because of problems with the “maglev” keyboard. Therefore, detailed reviews of this device on the web until recently actually was not. The gap was filled by specialists of the English-language resource Notebookcheck, which managed to get two XPS 15 configurations for testing (9575). Based on the results of the study of their capabilities, foreign colleagues came to the conclusion that the younger processors of the Kaby Lake-G family – the Core i7-8705G and the Core i5-8305G – show almost the same performance being “packaged” into a 9 mm thick case (16 mm including a display) .
According to the official specifications of the above-mentioned pair of 65-watt Kaby Lake-G models, the Core i7 processor has a higher operating frequency (3.1 / 4.1 GHz vs. 2.8 / 3.8 GHz) and an increased cache memory third level (8 MB versus 6 MB). This advantage, coupled with the use of 16 GB of RAM in the older configuration (in the younger one – 8 GB), should theoretically provide a tangible gap in performance, but in fact the difference in the speed of devices costing $ 1500 and $ 2,200 turned out to be symbolic.
Kaby Lake-G processor specifications
Particular attention should be paid to the results in the test Cinebench R15, where XPS 15 on the basis of Core i7 first collects 746 points, and then sits up to 641-684 points. Core i5 behaves in a similar way: 709 points at the first run of the benchmark and 631-673 points at the subsequent. The average performance of Core i7-8705G and Core i5-8305G is 699 and 681 points respectively – they share only 2.6%. Both processors automatically reset frequencies, and, first of all, this applies to the older model.
Game tests determined the advantage of Core i7-8705G over Core i5-8305G at 0.4-1.1 fps with the maximum graphics quality settings in BioShock Infinite and Rise of the Tomb Raider, and high in the Batman: Arkham Knight and Ashes of the Singularity.
Judging by the photo of the Dell XPS 15 system compartment (9575), in the new “2-in-1” engineers have tried to do everything in their power to effectively cool the 65-watt Kaby Lake-G processor. However, three flat heat pipes and a pair of 50-mm centrifugal fans were not enough to make both Core i7-8705G and Core i5-8305G work at full power.
The heating of both configurations of the “9575” was within reasonable limits. The testers managed to warm up the processor with the game The Witcher 3: Wild Hunt only to 65-70 ° C (iGPU Radeon RX Vega M GL showed itself even less hot). The maximum surface temperature of the XPS 15 housing was 45.8-45.9 ° C.