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MSI GX60 Review - Radeon HD 7970M In A $1,200 Gaming Notebook (Part 8) - Battery life, AC draw, and charging speed

9/9/2013 9:19:59 PM

Battery life, AC draw, and charging speed

Battery life

Battery life is the general capacity of the power source (in WH) divided by the power used. The GX60 has an 87Wh battery, so an average 15W load creates nearly six hours of longevity. Increasing consumption to only 5W is going to drop down to an hour of use. At its peak power-consuming scenario of 79W, you will only have slightly more than an hour of runtime when not plugged into AC power. In return for that major change, the machine does not throttle down like the other laptops. It is up to you whether you want to maximize runtime or performance, depending on what you're doing.

Battery life

Battery life

With the display at minimum brightness level, Wi-Fi off, and Windows 7 set to the "Power saver" mode, the GX60 uses 11,067W. This is the lowest possible power, but with the screen is reduced, it is not ideal for daytime viewing. Increasing screen brightness to 50% uses the power of 12.34W, while the maximum brightness uses 14.7W. Switching on the Wi-Fi card adds nearly 1W to any of these numbers.

Browsing the web with Wi-Fi on boosts the power usage at 50% brightness from 13.1W to 15.4W on simple websites, and from 15.9W to 17W on websites with numerous ads or Flash. The average power usage during 30 minutes of web browsing is 16W. Viewing 480p videos on YouTube uses 21.8W, while 1,080p video uses 22,995W. At full load, the CPU uses 43W, with the GPU using 59W. The maximum increase of power use for the system generates 79W / h.

The chart shows the expected battery life for many of the usage scenarios.

The chart shows the expected battery life for many of the usage scenarios.

Typing notes on the GX60 for six hours or more will not have any problems. Even when adding web browsing, you will still see approximately six hours, as long as the Radeon HD 7970M is not enabled. Please wait for about three hours of playback on battery power while viewing streaming video, standard-definition content (480p) might even play for up to four hours. From one hour to 90 minutes of playing games is a reasonable period of time to expect when using the Radeon HD 7970M. The built-in GPU on AMD’s A10-4600M is faster than Intel’s HD Graphics 3000 machine, so make sure that you could probably have 3 hours of play in a game that did not require heavy graphics like Civilization V by using the A10, while you would struggle to have playable performance from an Intel-based computer when utilizing on-die graphics.

In a month of use, our typical battery life lasted about from five to six hours.

AC Power and charge speed

AC Power and charge speed

AC Power and charge speed

Charging the battery with the system off will use 60W from the socket, while running idle in Windows with the battery that is fully charged uses 22W. The charge speed is 29W/h with Windows running, utilizing the total power up to 80W

Fully loading the GPU will use 162W from the socket while APU uses 69W with Turbo Core enabled and about 58W when Turbo Core is not used. Remember that each of these measurements also includes the other parts in the system, such as chipset, screen, Wi-Fi and drives. Running the tests for numerous games, the power used varies between 114W and 171W. Fully loading the system draws 171W, with the highest level of 180W when the APU’s Turbo Core is enabled.

Under full load on the APU or GPU, the charge speed is still at 44W/h. Only when the CPU and GPU are fully loaded, does the charge speed decrease to 8.87W/h. There is no major difference in the charge speeds when the system is on until the system is fully used. Even after taking the efficiency losses in the power adapter into consideration, the battery still charges more rapidly when the machine is still not on.

Storage and audio performance

Storage performance

Storage performance

Storage performance

Our GX60 test unit is configured with two SanDisk SDSA5DK-064G 64 GB mSATA SSDs in RAID 0 for the main system drive. It also holds a Western Digital WD7500BPKT-22PK4 750GB 7,200 RPM hard drive for a secondary storage.

Running a quick benchmark with CrystalDiskMark, the RAID 0 SSD array attains read speeds as fast as most of the best-quality 2.5-inch SSDs on the market. However, the write speeds are not so great, what we may expect from the 64GB storages. Observing the results purely from a gaming point of view, performance will be good because most games require reading files.

Running CrystalDiskMark on the 750 GB hard drive gives predictable results.

In general, the performance of the GX60 repository is perfect in daily use. The machine is fast and starts up very rapidly. The SSDs would give better results if they were larger, although naturally that would cause its price to rise.

Audio performance

Sound that is transmitted to the external amplifiers via the analog headphone jack or digital HDMI port sounds pretty good. We did not encounter any problems when connecting to a digital receiver or multiple televisions throughout HDMI. We did not hear any noise when playing music through the analog output.

The built-in speakers of GX60 are very excellent. In fact, it is one of the best speakers we've ever heard on a laptop. They deliver a great stereo image and tonal range, enhancing the ability of GX60’s gaming. While the subwoofer on the bottom of the GX60 might be small, it still gets the job done well in the lower frequencies.

The built-in speakers of GX60 are very excellent.

The built-in speakers of GX60 are very excellent.

We listened to music via the headphone jack with some suites of the IEM headsets. Through the extremely sensitive Etymotic HF3 in-ear earphones, we did not hear any noise and music playback sounded very good. Through the slightly bass-heavy Bowers and Wilkins C5 in-ear earphones, the sound was also good, as was listening with the Shure SE425 in-ear earphones.

We listened to music via the headphone jack with some suites of the IEM headsets.

We listened to music via the headphone jack with some suites of the IEM headsets.

We also had the two pairs of traditional over-the-ear headphones to listen. The 32-ohm Grado SR125s sounded good and the GX60 was able to control them without having any issues. With the Sennheiser HD600, the GX60 did what most of the laptops could not. The headphone-out made the 300-ohm load sound pretty loud. The sound through the HD600s was a bit mid/bass-heavy and not as vivid and detailed as the dedicated headphone amplifiers, but they still sounded fine.

The GX60 will not have any problems that control any gaming headset.

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