Hands on with Windows 8 CP: Battery life test

Tablets and Ultrabooks are on the rise and Windows-on-ARM (WOA) tablets are on the horizon. For Windows 8 to succeed in today's -- and tomorrow's -- market for both low- and high-powered portable devices, Microsoft needed to get rid of its "fat" Windows without losing functionality. The goal was to not just increase responsiveness, but also to improve battery life, which is obviously one of the core criteria for everyone shopping for a new laptop or tablet. How does Windows 8 fare? We've got answers".

Microsoft's promise: Less energy consumption

Redmond pushed out almost a dozen blog posts that either demonstrate their battery life/power consumption improvements or show off how new their new features (e.g. USB 3.0 support, Connected Standby, Live Tiles, Metro Apps) are built with saving power in mind.

Here are the highlights:

All background Metro-style apps will be suspended; only the foreground app consumes resources and thus battery life. If an app is not on screen and actively used, it shouldn't drain battery. Only a set of apps will be allowed to use background activity (e.g. for music playback or printing).

. Improved idle usage of the OS.
. On-system drivers, such as the USB host controllers and keyboard drivers, put the device into low-powered modes sooner.
. Memory deduplication mechanisms to reduce RAM workload.

Battery life benchmark: Windows 8 consumer preview

"We think of power as a critical system resource, just like CPU utilization, hard disk activity, or memory consumption." explains Pat Stemen, a Program Manager on the Windows Kernel team, on the B8 blog.

So how power-friendly is the new Windows exactly? We wanted to put Windows 8 CP up for a test run on a variety of laptops and see how it stacks up against Windows 7 SP1. Here's the hardware I used:

Laptop A -- Acer Aspire 7551G. A Run of the mill 17-inch laptop with a Phenom II X4 CPU and 4 GB of RAM. Good for multimedia, but not particularly well-suited in the battery life department.

Lapotp B -- Samsung NC 10. One of the better 2008-era netbooks. The usual yada-yada specs (Atom N270 1.6 GHz, 1 GB RAM). Low performance, extremely good battery life.

Laptop C -- 13" MacBook Air (2011) equipped with a 1.8 GHz Core i7, 4 GB of RAM and a 256 GB SSD drive.

I didn't test on an ultrabook, but the MacBook Air running Windows matches the most current ultrabooks in terms of specs, battery power and form factor.

All three represent very different laptops, targeted at very different audiences. Evaluating these devices should give a good glimpse of what to expect on the battery life front.

Test scenario

I used PCMark 7's "Lightweight" test, which simulates typical workloads such as adding music to Media Player, browsing the web, copying files and scanning for malware while leaving a couple of seconds of idle time in between. I looped the test until the battery of the device ran dry. Second, I just let the laptop sit there, do nothing and just "die". While that's not a particular realistic scenario, it demonstrates idle usage which is very important for battery life: Remember, you're not constantly pushing your CPU to its limit -- while you're reading something, sitting in a meeting or just waiting in between presentation slides, your laptop needs to go into idle as fast as possible and stay there until you do something. It is a good basis for judging power management.

Since third party software usually impacts battery life, I installed only the very basic programs such as Office 2010, TeamViewer, SnagIT, Adobe Reader and Flash on both machines. In all cases, I used the "Balanced" power saver mode and cranked up brightness to about 50-70%, while leaving Wi-Fi on.
Results

I repeated each test run exactly three times to avoid discrepancies. In each and every case I got pretty much same results (+/- 5 minutes). Results are measured in minutes:

Microsoft has done its homework. Idle performance of Windows 8 seems to best that of Windows 7 SP1 in every case. This is especially true on the MacBook Air: Here, idle battery life increased by 51 minutes. Even under the PCMark 7 workload, it managed to squeeze 24 minutes of additional battery life out of the machine. Our trusty old Samsung NC 10 ran for 40 more minutes in "idle" while it gave me another 20 minutes under typical workload. While that's not a lot, it may just mean the difference between wrapping up a movie or work on an airplane and having to stare at a blank screen for the rest of the flight.

Resource from:http://www.itworld.com/windows/254380/hands-windows-8-cp-battery-life-test?page=0,0

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Body can Recharge Cellphone and Laptop

The one thing you had thinked that,which imagine being able to use your own body heat to recharge your phone or laptop.
Scientists in North Carolina have recently developed a felt-like fabric that generates power by scavenging for so-called waste heat, such as body heat.
Right now, many of the electronic devices we use every day, such as cellphones or laptop computers, get their power from batteries.But, as we also know, even the best batteries eventually run low on power and need to be recharged.
What the Wake Forest University scientists have done is develop technology that takes your body heat, along with other waste heat, and convert it to electrical energy.
Developed at the university's Center for Nanotechnology and Molecular Materials, the material is made up of carbon nanotubes, tiny tube-shaped materials made of carbon, which are held in flexible plastic fibers and made to feel like fabric.
The researchers say the thermoelectric technology behind Power Felt uses differences in temperature, such as room temperature versus body temperature, to create an electrical charge.
Professor David Carroll, director of the Center for Nanotechnology and Molecular Materials, says that thermoelectric technology, until now, has been tied to expensive hard ceramic material which is difficult to produce.
While the Power Felt technology might not be as high performing in producing thermoelectric power as its more expensive counterpart, Carroll points out the cost of producing the Power Felt material is much cheaper. Consequently, the total number of dollars per watt of generated power is significantly less in comparison.
Carroll says that there are many ways that Power Felt can be used at a consumer level. Just like with a blanket, you could put the material over a variety of battery-powered devices, or wrap it around things like the handle of a flashlight, to get the extra juice needed to run those devices.
Other practical applications could include lining the seats of an automobile with Power Felt to boost the car's battery power, insulating pipes or collecting heat from under your roof tiles to generate enough power to lower your gas or electric bills.
"Power Felt is best at supplementing the power that you already have," says Carroll, adding that the greater the temperature differences, the more power the material generates.
Carroll says that the inspiration for Power Felt came from the concept of organic electronics, which he describes as flexible, printable, throw-away electronic devices.
In developing Power Felt, his team was out to create a textile that could literally be integrated into clothing, and then used to generate enough power, for example, to extend the battery of something critical like a pacemaker.
The whole idea for developing Power Felt technology, says Carroll, is to try to address the electrical needs of mobile electronics.
"While our team was discussing what could we do to do this, it happened that my wife calls me on my cell phone," Carroll says, "and if you have one of these smartphones, you could watch the power meter go down. The battery doesn't last very long. And it became really evident that not just medical devices, but all kinds of devices that we carry with us every day,need supplemental power."
According to Carroll, one way of providing the extra power needed for these devices is to invent a better, more efficient battery, but the costs of doing that could be very prohibitive.
Another way to do this, he suggests, is to generate power onboard the device by integrating thermoelectrical material, like Power Felt, into the construction of the electronic unit, like the plastic covering on a cellphone.
How much power does this Power Felt technology actually provide?
According to the team, 72 stacked layers in the fabric can yield about 140 nanowatts or 140 billionths of one watt of power. The team is continuing its work on the development of Power Felt and is evaluating several ways to add more nanotube layers and make them even thinner in order to boost output power.

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Asus new product: phone-tablet-laptop combo

It's a smartphone that slides inside a tablet for a bigger screen and more battery life. Slip the tablet into a keyboard, and it's a laptop that works as a phone.

Taiwan's AsusTek will roll out its "PadFone" in April, and offered a peek at the three-in-one device at the Mobile World Congress in Barcelona, the world's biggest cell phone show.

AsusTek didn't reveal the cost on Monday, but said the phone will have a 4.3-inch at the diagonal screen. The tablet is 10.1 inches at the diagonal. The company says it provides five times more phone battery life.

Company chairman Jonney Shih says the "time has finally arrived when every screen in your lives could transcend into a portal with real time access into your digital world."


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Tips of 'Ivy Bridge' MacBook, Windows laptops

Intel's upcoming Ivy Bridge chip will be a big step up in graphics performance for Intel. And benchmark numbers suggest that you may want to wait for that new Ivy Bridge-based MacBook or Windows lappy before upgrading your system.

A Chinese-language Web site has posted benchmark numbers (reposted by CPU World) that show a jump in graphics processing unit (GPU) performance of up to 122 percent over the current Sandy Bridge processor.

"In 3DMark Vantage synthetic benchmarks Core i5-3570K (Ivy Bridge) achieved 88.9% higher GPU score when using Entry preset, and 122.1% better score with Performance preset than [the] Intel i5-2500K (Sandy Bridge)," said CPU World.

And a faster GPU is important not only for games but for a host of multimedia-related operations such as transcoding and image manipulation.

Other chip Web sites have weighed in about Ivy Bridge performance recently. "[Ivy Bridge's] underlying architecture is completely new. Between architectural changes, clock speed increases, and other changes, Intel is claiming about 2x the graphics performance...We don't think these claims are out of line for the general case," said chip-centric site Semiaccurate.

Below are gaming benchmarks showing the increase in performance numbers when comparing the Ivy Bridge i5-3570K with HD 4000 graphics to a Sandy Bridge i5-2500K with HD 3000 (via CPU World):

* Left 4 Dead 2: up 71.6 percent
* Street Fighter IV: up 43 percent
* Starcraft II: up 30.2 percent
* DiRT 3: up 51.8 percent
* Farcry 2: up 84.5 percent

Of course, no article about Intel graphics performance would be complete without mentioning that a system with a separate graphics card from Nvidia or Advanced Micro Devices is going to deliver better performance.

However, many of the super-skinny ultrabooks due in the coming months (and already out) either don't have room for a standalone "discrete" graphics chip or the designers simply decided they don't need it. Not to mention the fact that PC makers essentially get the graphics for free because the Intel GPU is built into the Ivy Bridge chip, right next the CPU (central processing unit).

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Can We Take a Laptop into Cuba on a trip ?

Many people do not not that Whether take a laptop into Cuba on trip? Don't worry that,there is no problem whatsoever with taking a laptop and accessories on your trip to Cuba. Several hotels in Havana and some in other parts of the country have Internet connections. Some very slow, others relatively fast (Hotel Melia Habana, Hotel Melia Cohiba, Hotel Panorama, Hotel Parque Central in the capital.). Most of the hotel websites clearly let you know if they have WIFI, service-only on their computers or no Internet access. Expect to pay between 6 and 8 CUC (7 to 9 USD) per hour for WIFI.

There are some hotels with round 220 volt electrical outlets so it wouldn’t hurt to bring an adapter that goes from your flat plug in to two round ones, since the adapters are sometimes scarce.

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