The Intel Core i5-1035G1 is a power efficient quad-core SoC for laptops and Ultrabooks based on the Ice-Lake-U generation that was announced in May 2019 (Computex). It integrates four Sunnycove processor cores (8 threads thanks to HyperThreading) clocked at 1 (base) - 3.6 (single core Turbo) GHz. 2 cores can reach 3.5 GHz (unverified) and up to 3.2 GHz are possible for all 4 cores with the Turbo Boost technology. According to Intel the Sunnycove cores achieve 18% more IPCs (Instructions per Clock) and therefore the CPU performance should be similar to the higher clocked Whiskey-Lake predecessors (e.g. Core i5-8365U with up to 4.1 GHz). The difference of the Core i5-1035G1 to the similar i5-1035G4 and i5-1035G7 is the base clock (100 MHz lower here) and the iGPU model (UHD Graphics instead of the Iris Plus here).
The biggest improvement for Ice-Lake is the integrated Gen 11 graphics adapter called UHD Graphics G1. The Core i5-1035G1 integrates the smallest GPU, the UHD Graphics that features 32 of the 64 CUs and clocks at 300 - 1050 MHz. The faster variants include Iris Plus G4 and G7.
Other improvements for Ice Lake are the AI hardware acceleration and the partial integration of Thunderbolt and Wi-Fi 6 in the chip. The integrated DDR4 memory controller supports modules with up to 3200 MHz (and LPDDDR4 3733).
The Core i5-1035G1 is produced on the first-gen 10 nm Intel process that should offer a comparable performance to the 7 nm TSMC process. The TDP is specified at 15 Watts and therefore the CPU can be used in thin and light laptops (but usually with a fan). Intel offers a configurable TDP of 7.5 - 25 Watts for the partners resulting in significant performance differences (due to longer periods of Turbo Boost).