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Old 05-12-12, 04:01 PM   #87
Rakeesh's Avatar
Join Date: Jun 2004
Location: Sonoran Desert
Posts: 6,884
Default Re: Samsung phones outselling Apple

Originally Posted by jeffmd View Post
No, quad-core on a phone is a complete waste. In fact it is a uneeded power drain.

The plan of attack for applications is to use as less cpu time, and thus less power as possible first of all. When it comes to pc, you only see quad cores come into their own on 2 things, video compressing (and like wise jobs like render farms), and games. The former has no place on the phone platform and the latter, the games are not anywhere near that complex, nor should games be wiping out your battery in an hour.

Dual core has always been the sweet spot, one core for OS operations, and the other is free to programs. Some programs and game are also ideal with 2 cores in which case the OS doesn't take up that much of one core so it is like having 2 full cores for the app itself. More than enough power.
Well gee, that must explain why quad core CPU's reduce battery consumption by 20%...oh wait, what were you arguing again?

Due to its 32nm HKMG low-power process and power-saving design, the Exynos 4 Quad has two times the processing capability over the 45nm process based Exynos 4 Dual while consuming 20-percent less power. To improve power efficiency, Samsung adopted hot-plug functionality to support on-off switching for each core as well as the per-core dynamic voltage and frequency scaling (DVFS), which offers a dramatic reduction in power consumption by adapting different levels of voltage and frequency when changing workloads.

Having identical form factor measurements (12mm X 12mm X 1.37 mm), the Exynos 4 Quad is pin-to-pin compatible with the 32nm process based Exynos 4 Dual, allowing mobile device designers to immediately adopt the new solution without additional cost, engineering or design efforts.

In addition, the new processor incorporates a full HD 30 frame per second video hardware codec engine for high resolution 1080p video recording and play-back, an embedded image signal processor interface for high-quality camera functionality and an HDMI 1.4 interface for sharp and crisp multimedia content transmission.

Samsung developed a power management IC (PMIC), the S5M8767, as a companion chip to power the Exynos 4 Quad processor. By integrating various circuitry such as nine highly efficient and programmable buck converters and 28 low-dropout regulators (LDOs) into the small package of 5.0 mm x 5.0mm x 0.4mm, the S5M8767 is designed to scale up or down the dynamic voltage depending on the clock speed in 6.25mV step for managing power delivery and maximizing battery life at the system level.
It's just like I said, when you have multiple cores able to scale their performance to match the demands of the particular thread they are running, you save power.
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