The G73 is a 17.3-inch laptop case powered by a 75Wh Asus G73 laptop battery; we know what that means, right? You don’t get a full day’s worth of computing, or even half a day (unless you work six hours a day). We also know that Sandy Bridge is more energy efficient than Clarksfield, so we should see some improvements over the G73JW. This is exactly what we got. Idle Asus laptop battery life increased by 17% to 3.75 hours, which was the smallest increase. Internet battery life is 27% longer, but just shy of the three-hour mark, while H.264 decoding time is 39% longer, at over 2.5 hours. While these are pretty impressive increases over the previous generation, let’s not overlook the benefits that switchable graphics can bring. In our Asus G73 laptop battery life test, a regular i7-2820QM laptop running the HD 3000 IGP lasted about twice as long and had a slightly smaller battery.
We can actually estimate the GTX 460M’s idle power requirements based on these results, and let me tell you, it’s not great. Based on the 71Wh Asus laptop battery and test various results, the Compal SNB laptop we tested had an average power consumption of 9.04 W when idle, an average power consumption of 10.24W during online testing, and an average power consumption of 16.38W during H.264 playback. By comparison, the G73SW averaged 20.64W idle power, 26.95W internet power, and 28.66W H. 264 decoding. This means that the GTX 460M requires about 10W when idle with very low clocks (50MHz core, 270MHz RAM), and about 15W when showing Flash ads in a web browser. The difference in H.264 encoding between HD 3000 and GTX 460M comes back to Arrived ~10W. Unfortunately, these high-powered GPUs aren’t very battery-life friendly, with the GPU alone consuming as much power as the rest of the laptop combined. That’s where NVIDIA Optimus technology comes in: Double the battery life of your Asus G73 laptop battery, the ability to use Intel’s QuickSync technology, and discrete graphics performance when you need it.
The plugged-in power numbers are all higher because the GPU isn’t in “limp mode” and we’re also running the LCD at maximum brightness. At idle, we measured 27W at the outlet using the Kill-A-Watt device; considering the power adapter’s inefficiency, that number matches up well with our calculations above. When we put 100% load on the CPU only (using Cinebench 11.5 SMP), the power consumption was a whopping 87W. various Across 3DMark tests, we saw a maximum “typical gaming” load of 114W, while Furmark managed to push the load on the slightly GPU, and we measured loads as high as 125W. Also interesting is that we were unable to get higher power consumption by running Furmark with the CPU loading utility. The CPU load was apparently enough to slow down Furmark performance, so our “worst case” CPU+GPU load was actually down to 118W. Again, given the inefficiency of the power adapter, there’s still plenty of room on the 150W power brick (unlike the 300W power brick in the Clevo X7200 with an SLI system), so you can even play games while charging the laptop battery
We’ve received requests from some readers for some additional battery life metrics. Charging time for the G73SW (with system powered on) is 168 minutes; charging may be slightly faster if the system is off, but with a 150W power brick there should be plenty of extra juice in the charging circuitry. If you wish to run the LCD at maximum brightness instead of 100 nits (or cd/m2, if you prefer), idle Asus laptop batteries life drops to 195 minutes. Therefore, an additional 55 nits of brightness requires approximately 2.5W of additional power. We also did an Internet test with Pandora open and streaming music in a separate browser tab; battery life dropped to 140 minutes. Finally, how about gaming on battery? With the GPU set to maximum performance , we looped through 3DMark06 for 67 minutes, but there was still a problem.
Even with our best efforts to achieve maximum gaming performance on battery power, the GPU was still throttled – and the CPU seemed a bit sluggish, too. We ran the full Futuremark test suite on battery power using the high-performance power profile. The graph below shows the performance percentage relative to the same test run with power outage (so a score of 100 means no change in performance). The best result is in PCMark, where battery performance is still 80% of plugged-in performance. Turning to the graphics tests, 3DMark05 managed to maintain almost 40% AC performance, with the 03/05/Vantage Entry having AC performance in the 30-32% range, and the Vantage Performance preset being less than a quarter faster. To put it in perspective, the gaming performance you’re seeing is actually worse than what you’d get with a mid-range GT 425M GPU.
The problem seems to be from the Asus G73 laptop battery delivering enough power to the GPU to achieve higher clock speeds, as mid-range GPUs don’t force performance on battery power (at least in my experience). Then again, the Asus G73 laptop’s battery life wasn’t significantly better when playing games on a mid-range GPU – I measured 104 minutes using a GT 425M, an 84Wh battery, an i3-380M CPU and a 14-inch chassis. In other words, althoughit’s possible to have a gaming laptop that gets good battery life (ie by shutting off the GPU), unless something changes in a big way we’re not going to get great gaming performance while on laptops batterypower. So fire up your smartphone and play some Angry Birds instead 🙂
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