I am wondering if someone has done this or has any ideas how it would perform?
Is it worth running a modern, or a couple of years old laptop (core i and so on) on half the number of cores
i.e 4x -> 2x and 2x -> 1x, to increase battery runtime?
The idea is that since todays CPU's are alot more powerful than previous generations, and especially OK to good business laptops in the 14-15" size and 1.8-2.4 kg (3,9 - 5,3 lb) usually have good but power hungry CPUs, then perhaps half the cores could cope with usual business/vpn/office task as write, read, surf, ms office etc like a breeze together with Win 8.1 + SSD. And at the same time, if I happen to need all cores - well, then I can just switch to all of them.
The background for this question is that I feel the need to move up from my Dell E4300 to something bigger, but don't wan't to loose battery runtime, and don't wan't it to weight alot more. The target is to get maybe 5-6 hours minimum runtime without looking for a socket.
As much as I've read in a swedish forum, the later generations of Core-i CPU's have a "rush to sleep" function that makes them to the work and then to go "sleep" in order to conserve energy. The idea being that it is better to to the work fast and then wait instead of running at a low constanst workload.