Do you happen to know what SoC the test tablet was running? Everything I read said it was the 5420. Btw, I don't own a Note 10.1 - I still have a ****ty iPad 3. I haven't heard anything from "idealists" just going over what I have read from folks at the event. From what I have read, it seems as likely to happen on the Note 10.1 and Note Pro as it is to NOT happen. I have heard it won't happen on the Note 3; however, I assume that is due to size and heat issues. Shouldn't be the case with the lager tablets.
Only time will tell. You or I certainly don't know. I'm gonna wait to buy a new tablet and keep an eye on it though.
I have had my Note 2014 (32GB) for two days and would not want to have both core sets running at the same time. The device can already get very warm in the SOC area and the battery drains just like my iPad 4 when playing 3D games- faster than I want it to. Games are smooth and ditto for apps, so not seeing an advantage of all eight, but see the two key disadvantages. Not running into any core hand-off issues some are reporting that can cause lag. Not yet anyway.
I use Nova for my launcher, since IMO much better than Samsung's. Based on performance, I see no reason for me to root the 2014. Very happy already, so see no need to rock the boat.
It is completely false to say that HMP would impact battery, if anything the opposite is true. There are very few applications which could even in principle use all 8 cores. Instead most of the times 3 is where apps max out, which would make little sense to enable HMP for performance reasons. But it makes all the sense in the world to enable it for battery reasons.
Samsung released a video a couple of months ago showing just that. Having all 8 cores enabled at the same time means that you have the 4 little one take most of the workload and the 4 big ones only be enabled as needed. This would result in unbelievable battery savings. Imagine an occasion where 4 little cores are not enough, what does the current implementation of big.little does? Oh but enable the 4 big cores disabling the little ones, so it ends up at times to light all 4 big cores when 4 little ones + 1 big one would be enough, this results in far lower battery.
HMP is a great idea both in paper and in practice, see the new Note Neo, it's using HMP to perfection and manages with "lower" hardware to perform as well as it's elder brother as well as be more energy efficient. *This* should be our example. Exynos 5420 is HMP compatible and it would only take a dev to enable it. I don't think that it will happen, but *if* it will it would instantly lead to far better devices...
Note 2014 has rather mediocre battery, my gf's ipad mini with almost half the MAHs has more juice. That's partly because the exynos chip is not very energy efficient. Enable all 8 cores and it will become that...
BTW the Note Neo sources (with HMP enabled) were just released. If we had a more active community I would expect an HMP patch coming from the community soon. Sadly seeing how badly misinformed most people are about HMP I don't think anyone would put the effort required and we'd stay with gimped devices ... oh well.
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