Galaxy S4, Note 3 will not be receiving full 8-core Exynos performance patch

It looks like Samsung is eating its words once again, coming at a time when people are accusing them of juicing their benchmarks again.
Their most recent flagships, the Galaxy S4 and Note 3, will most likely not achieve the full octa-core power in their Exynos chipsets, which was originally promised. This upgrade would boost performance significantly, and was a major selling point on these devices.  

What’s keeping Samsung from doing it? A Samsung engineer says that they can release a software patch that will allow both the quad-core Cortex-A15 set, and the Cortex-A7 cores to work together, however there might be issues with heat dissipation under pressure.

So, yes, overheating is the problem here. Because the Galaxy S4 and Note 3 are packed with the current thermal envelopes, which are only set to run with only four cores at one time, any fix won’t apply to them anyway.

(You could flash it, but your device could go up in flames.)

Source: Hi-Tech Mail