ASUS U30Jc Battery Life

ASUS has lately put a larger focus on battery life, and in the case of the U30Jc they easily eclipse the competition by including an 8-cell, 84Wh battery instead of the typical 6-cell units we see. ASUS also has their Power4Gear utility that lets you tune battery powered features, including the ability to shut off power to the optical drive, webcam, and WiFi adapter. We disabled all of those devices as appropriate for our battery life testing (i.e. we left WiFi enabled on the Internet test and disabled on the other two), and it looks like it helps the U30Jc provide a bit more mobility relative to other i3/i5 laptops. We set the LCD at ~100nits brightness, which is 47% on the U30Jc (seven steps down from maximum brightness if you're using the Fn+F5 keyboard shortcut).

Like the HP 5310m review, we have also included idle and Internet battery life results with the standard laptop build in place—i.e. without uninstalling all of the bloatware. ASUS pre-installed Trend Micro Internet Security (a 60-day trial), so you'll see these results in the charts below. Idle battery life doesn't take much of a hit, which is what we expect since the system shouldn't be doing anything (though we didn't see this when testing the HP with McAfee). Internet battery life on the other hand drops quite a bit, again in line with what we'd expect: the Trend Micro firewall needs to do some extra work if you're surfing the Internet. Naturally, if you choose to run without any sort of protection, you assume a risk. Casual users that don't know how to "surf safe" may need to bite the bullet and take a battery life hit.

Battery Life - Idle

Battery Life - Internet

Battery Life - x264 720p

Relative Battery Life

Considering the amount of performance packed into the U30Jc, the battery life is very respectable. In the "clean" state (which is how we tested all of the other laptops), maximum battery life is just over nine hours and Internet battery life is eight hours. Compared with the other i3/i5 laptops we've tested, the U30Jc is far ahead and even manages to beat out quite a few of the CULV laptops. Granted, that's largely due to the 8-cell battery, but in our relative battery life metric we still see a large lead over the other i3/i5 systems. Battery life during x264 playback (using Media Player Classic: Home Cinema and running on the Intel HD Graphics) we still get over four hours of battery life. It's interesting to note that the x264 test is the one result where the Lenovo T410 with a 9-cell battery is able to match the U30Jc.

With Trend Micro Internet Security enabled, battery life at idle drops about 3%—nothing too serious. Internet battery life in contrast drops 21%. Again, this is pretty much what we expected to see. Anyone who has used a system that's protected with anti-virus and internet security software can attest to the difference it makes in performance. That said, Trend Micro does appear to beat McAfee in light usage situations (McAfee caused a 35% drop in idle battery life on the HP 5310m), though we're not testing on the same hardware so we can't say for certain how the two compare. Stay tuned for more investigations in this area….

ASUS U30Jc 3DMark Performance ASUS U30Jc LCD Analysis


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  • solipsism - Wednesday, May 19, 2010 - link

    I'd like to see this machine compared with latest MacBook. There seems to be some evidence to suggest Apple did the right thing withs sticking with C2D this time around in their 13" machines. This machine seems to be a great machine which to compare. Reply
  • Daeros - Wednesday, May 19, 2010 - link

    I agree completely. For the extra hundred bucks, you get similar specs, even better battery life (and Bluetooth), as well as somewhat faster graphics. For all the bashing Apple takes for its pricing, it seems that whenever a pc company like ASUS or HP or Dell attempt to get to that level of size & performance, it winds up being very close in price.
    I second a request for this to go head-to head with the 13" Macbook.
  • anandtechrocks - Wednesday, May 19, 2010 - link

    I disagree completely. if you go by apple's claims you get less than 50 minutes more battery life, a processor that is anywhere from 15-40% slower, half the ram, a smaller hard drive, and a plastic case for $100 dollars more. I know what I'd pick... Reply
  • FATCamaro - Wednesday, May 19, 2010 - link

    Please note that the Asus doesn't appear to come with abgn networking instead just bgn. So it only has a 2.4Ghz radio it seems, not a 5 Ghz. one. I could be wrong. Other than that and the shit LCD it is a fine MBP alternative for Windows users. Reply
  • anandtechrocks - Wednesday, May 19, 2010 - link

    mbp is like $300 more than this isn't it? I think the regular MB is a better competitor, which also doesn't have the best LCD. don't forget apple offers half the warranty of this Asus too Reply
  • JarredWalton - Wednesday, May 19, 2010 - link

    Depending on the application, you'd need about a Core 2 P9700 (2.8GHz) to equal a 2.26GHz Core i3-350M. In highly threaded workloads, the only way you'd com anywhere near the faster Core i5 processors is by getting a Core 2 Quad, but with the lower clock speeds on quad-core you'll be slower in lightly threaded tasks (i.e. the i3-350M is as fast as Q9000 in PCMark Vantage). It all depends on the app, but when you consider Core 2 Quad also consumes quite a bit more power in testing (i3/i5 idle far better than C2Q), there really aren't too many areas where I'd recommend Core 2 over Core i3/i5.

    I think Apple went with Core 2 Duo (P8600) for the MacBook because they could reuse some old tech and got a good price more than anything. (Maybe NVIDIA gave them a good deal on the chipset as well.) It also keeps the standard MacBook a decent step down from the MacBook Pro.

    The Macbook has a 320M IGP GPU, so it has 3x as many shaders as 310M but it has to share system memory. (48 shaders at 950 vs. 16 shaders at 1530 means the 320M has 85% more shader performance but has to make do with about half the memory bandwidth.) That might mean it ends up with the same relative performance as the 310M in a lot of situations, depending on whether the particular game is bandwidth or shader limited.

    Other than slightly better battery life I'd say the U30Jc beats the MacBook in most other area. The size and weight are pretty much the same (MB is slightly thinner but not enough that I'd worry about it), ASUS gives you 4GB vs. 2GB, and a 320GB vs. 250GB hard drive. It's $100 cheaper and has aluminum surfaces as well. I'm curious about the LCD, though... MBPs have good LCDs, but the standard MacBooks have usually skimped there. 1280x800 vs. 1366x768 is a wash in my book but I'm sure some would prefer the 16:10 AR of the MacBook.

    Of course, if you prefer OS X over Windows 7 the choice is clear. Similarly, if you prefer Windows 7 there's no point in buying a MacBook. MacBooks booting Windows have never reached the same battery life as under OS X. Anyway, we'll see if we can get a MacBook for testing, but I won't be the one doing the review.
  • VivekGowri - Wednesday, May 19, 2010 - link

    The 13" MacBook Pro also has a Core 2 Duo, suggesting more that Apple didn't want to put Core i5 processors into the smaller/cheaper models. Whether this is because they wanted to differentiate the larger/more expensive 15" model, or because they wanted to maximize profit margins (C2D's must be dirt cheap right now...) we don't know.

    It just doesn't seem entirely likely to me that they couldn't do it or couldn't fit both the larger i5 processor package and the secondary IGP into the MB/MBP case (there are enough other laptops with Core iX and dedicated graphics out there in small chassis; the U30Jc is just one example). Also, I'm not buying Steve's comment that Apple couldn't justify the "very small CPU speed increase".

    I may (*may*) end up with one of the newly updated MacBooks sometime soon, but as Jarred says, we'll see if we can get one and who does the review.
  • Penti - Wednesday, May 19, 2010 - link

    Hardly, a Core i5-520M costs $225 and a P8600 costs $209 (listed price), there no price difference in the processor/chipset platform. It's $265 with chipset for 520M + HM55. Apple might get an rebate, but they might get one or the newer platform too. It's probably the same cost as the old hardware any way. Overpriced as usual. Reply
  • Penti - Wednesday, May 19, 2010 - link

    I think more then likely it's just space concerns that has them using C2D + NVIDIA chipset, they do the same in the MBP 13" for the same reason. Switching to Core i5 + HM55 + GPU / Memory takes up more space on the circuit board. Something there aren't a lot of on Macbooks. Of course this is essentially the old Macbook so they could reuse pretty much everything anyway. The chipset is probably even pin-compatible. But they appear to have tweaked the battery though, although the case itself is exactly the same.

    Of course something like adding to the size of the PCB would dictate a case redesign and the removal of the dvd-drive possibly.
  • JarredWalton - Thursday, May 20, 2010 - link

    As I pointed out in the MacBook posting comments, there's no problem with getting all of the components with a discrete GPU into the MacBook. It's .1" narrower and .4" less deep, but ASUS has a removable battery that accounts for much of the extra depth. Apple chose the old platform for cost savings--both for the lower prices on the CPU+chipset as well as the ability to reuse the old design without having to spend a lot of time on accommodating a new chipset, CPU, etc. The sad thing is that Apple doesn't pass any of those savings on to the customer: a MacBook still costs $1000, even if it has two year old technology--outside of the chipset, which you could argue is "new". Too bad we never got a chance to have that chipset back when it would have been useful; now it's relegated to Core 2 platforms that are going away. Reply

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