Swedish page Sweclockers has published some tests that compared Intel Core M “Broadwell-Y” and Haswell Core U processor at the same clock speed and if you see the performance between both, you will be amazed as Intel Core M “Broadwell Y” is only 3% faster than Haswell Core U processor in performance. This is slightly lower than Intel promised as they said 5-7% improvement.
Since this time, Intel has actively jumped into the mobile processor market, the new processor power consumption is very low, while the increment in speed is not satisfactory. The first laptop which is equipped with Intel 14nm Broadwell-Y model is Lenovo Yoga 3 Pro. Intel Core M 5Y70 that fused in Lenovo Yoga 3 Pro comes with 1.1 GHz base frequency, and in turbo boost can reach upto 2.6GHz on both cores.
On the other side Surface Pro 2 is equipped with Core i5-4200U, the clock frequency is 1.6 GHz and turbo boost is upto 2.6GHz. It is worth mentioning that both test systems are powered with DDR3 memory at 1600MHz in the two channels.
The benchmark represents that Broadwell is ahead in each test, but does not full its expectations.
If we talk about the power consumption, in Cinebench R15 test, M 5Y70 TDP at full load reaches 4.5 W, while on the other hand Haswell Core U TDP reaches to 15 W. Almost 342% difference.