Sources: HTC on Weibo, via GSM Arena
quote: Well the first Exynos 5 octa (Galaxy S4) is clearly an example of a mobile CPU branded as octa core in which only 4 cores can be active at a time.
quote: If qualcom do not explicitly states that all 8 cores can be active at the same time, I conclude only 4 of them can be active. Otherwise they would brag about it. Anyways the low power cores are usually so slow that the added performance is negligible.
quote: As a result they couldn't bring all eight cores to bear at once... they had trouble bringing even four online effectively.
quote: The whole point of Samsung's design was to have either 4 little cores or 4 big cores active at a time, hence big.LITTLE.