Even Better Battery Life

I've never had such a great balance of performance and battery life as my previous generation unibody MacBook Pro. Whatever Apple is doing under OS X to deliver great idle battery life really does pay off. If you're not constantly pegging the CPU, OS X can deliver some incredible battery life.

It does get better with Arrandale. Remember with the Core 2 processors you couldn't actually shut off the cores if they were idle, they'd still leak power. Thanks to Arrandale's power gating, if a core is idle, it can effectively be shut off completely. In other words, battery life in situations where there's lots of idle time (e.g. read web pages, writing) should improve.

To test this theory I ran our standard wireless web browsing test:

Light Web Browsing

Here we're simply listing to MP3s in iTunes on repeat while browsing through a series of webpages with no flash on them. Each page forwards on to the next in the series after 20 seconds.

The display is kept at 50% brightness, all screen savers are disabled, but the hard drive is allowed to go to sleep if there's no disk activity. The wireless connection is enabled and connected to a local access point less than 20 feet away. This test represents the longest battery life you can achieve on the platform while doing minimal work. The results here are comparable to what you'd see typing a document in TextEdit or reading documents.

As expected, the new MacBook Pro delivers a 10.5% increase in battery life. Not all of this is due to the more efficient CPU/GPU however. The 15-inch MacBook Pro has a larger battery than before (77.5Whr vs. 73Whr).

It's not all rosy though. The larger battery was used in part to make up for the fact that Arrandale, while more efficient at idle, can draw more power under load than Penryn. The Core i5 can be noticeably faster than last year's Core 2 Duo, but in allowing you to do more it can run the battery down quicker.

In our original Arrandale review we found that battery life can actually decrease with the new platform under certain conditions. Our heavy multitasking test shows the same can happen under OS X:

Multitasking Battery Life

Our final battery life test is the worst case scenario. In this test we have three open Safari windows, each browsing a set of web pages with between 1 - 4 flash ads per page, at the same time. We're also playing an XviD video in a window all while downloading files from a server at approximately 500KB/s.

It's not a large drop, only a couple of percent, not even noticeable. But you shouldn't expect battery life improvements across the board with the new MacBook Pro.

The GeForce GT 330M Bigger Power Bricks, Warmer Laps
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  • san1s - Wednesday, April 14, 2010 - link

    This or one of the new Sony Vaio Z series? Reply
  • rowcroft - Thursday, April 15, 2010 - link

    I chose the Sony Z- love the size and was able to get it with the i5 and a SSD for around $1,900. 3.5lbs and 1600x900 13" was too much for me to resist (and I do like OS X). Reply
  • androticus - Friday, April 16, 2010 - link

    I just tried out a Z at the Sony Store -- sweet! The 15" MBP is huge and heavy by comparison. I really feel that Apple is not offering a compelling upgrade this time -- and even upping the base model price by $100! Reply
  • SandmanWN - Wednesday, April 14, 2010 - link

    Steep price for only 5400 rpm drives!
    All that room and can't add a number pad to the keyboard.
    The plug on the power brick has got to be annoying sometimes.

    Nice resolution on the screens.

    Overall for the price the attention to detail is kind of disappointing. Not to mention the styling feels sooooooo old now.
    Reply
  • Brian Klug - Wednesday, April 14, 2010 - link

    Honestly, I'm really confused why they're shipping 5400 RPM drives as well. Ordering online, the 7200 RPM drives are a whole $50 more, which, in the big perspective of things is change next to the MacBook price.

    It seems like the volume discount from shipping exclusively 7200 RPM drives on a "pro" machine would've made more sense than a bunch of default configurations with 5400 RPM drives destined to sit in stores.

    -Brian
    Reply
  • randfee - Thursday, April 15, 2010 - link

    styling = old? Kidding me?

    The Style is rather new, just one and a half years now, isn't it? The prior design lasted for 6 years and my mid 2007 MBP still looks stunning, a timeless design and the aluminum surface is VERY durable. Comparing my almost three year old one to a most other brands with the same age makes people say mine looks like new.
    Reply
  • ltcommanderdata - Wednesday, April 14, 2010 - link

    I'm still curious why Apple chose the nVidia GT330M with it's 23W TDP. ATI's Mobility HD5650 is supposed to have a TDP between 15-19W, while still being faster so would seem like the ideal choice if performance/watt is the major concern. Hopefully, Apple developing their on dynamic GPU switching implementation was motivated by trying to make a GPU agnostic method to not be tied to say nVidia and Optimus. Presumably, the GT330M drivers are more mature in OS X due to similarity with existing nVidia GPUs and that combined with price and bundling offers with the 320M cause Apple to choose nVidia in this round, but hopefully ATI isn't permanently locked out of Apple notebooks.

    It's also interesting to note that the GT330M is underclocked at 500MHz core versus up to 575MHz and 1100MHz shaders versus up to 1265MHz being supported by nVidia. Apple's clocks actually match the GT230M. If this was done to reduce power consumption and thermals, that's another reason the HD5650 would have been a better choice.
    Reply
  • jimhsu - Thursday, April 15, 2010 - link

    Or simply opting for 335M (50% more shader cores) would boost graphics performance even more. Though with the heat comments, maybe that isn't such as good idea. I'm reminded with the quite unsatisfactory heat performance (i.e. OMG WTF THIS IS BOILING) of my first gen Macbook Pro (early 2006) with some of the comments in this article. Worrisome. Care to post some temps? Reply
  • redbone75 - Thursday, April 15, 2010 - link

    I would guess it's because Nvidia, not ATI, is their partner and they have to honor that relationship. Think of how p/o'd Intel was when Apple ditched them in favor of Nvidia's chipsets. Reply
  • MySchizoBuddy - Wednesday, April 14, 2010 - link

    based on the table Core i5 540M looks better than Core i7 620M Reply

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