![]() Our review device comes equipped with the BIOS version 1YCN35WW (V2.02). ![]() Presumably, this may also apply to the sibling model, when one installs the latest version of the BIOS. Lenovo appears to have provided a few options for fan control. Nevertheless, more than a few users will find the fan noise annoying, especially when they are trying to concentrate on their work Under load, the fan of our review device operates somewhat quieter than the fan of the previously-reviewed sibling model. When only Prime95 is running, the noise level increases up to 36 dB(A). During our stress test (in which we run Prime95 and FurMark for at least one straight hour), we measured a sound pressure level of 34.7 dB(A). Under heavy load, the fan does not spin particularly hard. However, even very light loads can cause the fan to start spinning. As a rule, the fan stands still at idle and under light loads. The convertible does not get very noisy under all sorts of loads. The Turbo boost is not utilized at all, and the CPU operates at frequencies which are well below its own base clock. ![]() After the first benchmark run, the results drop to 390 points and stay consistently at that level. We check if the Turbo boost can be used over an extended period of time by running the Cinebench R15 Multi-Core benchmark in a continuous loop for 30 minutes. This behavior is identical when the laptop is plugged in and when it is running off of battery power. In the “Geekbench 3” benchmark, the CPU operates almost constantly at 1.8 GHz. However, in these benchmarks, the boost clock of 3.7 to 4 GHz was maintained for a little longer. Things look the same with the “Geekbench 4” benchmarks. After a few seconds, the CPU is throttled down to 1.8 GHz. In the “Cinebench” benchmarks, the CPU can run at its maximum clock speeds (Single-core: 3.7 to 4 GHz, Multi-core: 2.8 to 2.9 GHz) for only a very short time. This ULV model (TDP: 15 watts) runs with a base clock of 1.8 GHz, which can be boosted up to 4 GHz. Lenovo has put a quad-core Intel Core i7-8550U (Kaby Lake) CPU inside the Yoga. ![]()
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