Sony attracted considerable criticism for the tiny improvements it made in the Sony Xperia Z4, which has only been made available in select regions thus far. Now it turns out that the main difference between the Z4 and last year’s Z3, the Snapdragon 810 CPU, may not be such an improvement after all.
On benchmark tests and solitary tasks, the Xperia Z4’s Snapdragon 810 is clearly faster. However, in this case the tester puts both phones under the same multitasking load, quickly booting up and exiting the same sequence of apps, all while a timer runs in the background.
The result is that the Sony Xperia Z3 completed its task sequence seven seconds faster than the Sony Xperia Z4.
While this isn’t the most scientifically sound of tests, it does demonstrate how the Snapdragon 810’s much-documented thermal issues affect its performance. When multiple demanding tasks are run concurrently, the CPU throttles back in order to avoid excessive heat build-up.
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The result appears to show a slower chip under load than even last year’s supposedly inferior model.
Qualcomm’s current top-end chip has had a rough time of it in 2015, with first Samsung and then LG choosing alternative options for their latest flagship phones.