Battery Life

The 13-inch rMBP features an integrated 74Wh, non-user-serviceable lithium polymer battery. The smaller chassis forced the use of a smaller battery compared to the 95Wh part used in the 15-inch rMBP. With a 22% reduction in battery capacity, the question is whether or not the drop in power consumption will keep battery life balanced between the two systems. CPU TDPs also go down by an identical 22% (45W down to 35W), but the comparison is more complex than that. The 15-inch rMBP has an on-board discrete GPU that, when active, can significantly impact battery life. Without the dGPU inside the system, the 13-inch rMBP does potentially have an advantage.

To quantify battery life, I turned to our updated OS X battery life suite that I introduced earlier this year. As always we have three individual tests, each simulating a different amount of load. All battery life tests were run with the display calibrated to 200 nits. The test descriptions are below:

The light and medium suites are inherently related - they use the same workload and simply vary the aggressiveness of that workload. The light test hits four different websites every minute, pausing for nearly the entire time to simulate reading time. Flash is enabled and present on three of the sites. The long pause time between page loads is what really makes this a light test. Web browsing may be the medium for the test but if all you're doing is typing, watching Twitter update and maybe lazily doing some other content consumption this is a good representation of the battery life you'll see. It's a great way of estimating battery life if you're going to be using your notebook as a glorified typewriter (likely a conservative estimate for that usage model).

The medium test hits the same webpages (Flash and all) but far more aggressively. Here there's less than 10 seconds of reading time before going onto the next page. It sounds like a small change but the impact on battery life is tremendous.

Both the light and medium tests are run in their default state with processor graphics enabled, as well as with the discrete GPU forced on. I run with the dGPU on as well because it's far too often that a single application open in the background will fire up the dGPU and contribute to draining your battery. The goal here is to deliver useful numbers after all.

The final test is very similar to our old heavy multitasking battery life tests, but with some updates. Here I'm downloading large files at a constant 1MB/s from a dedicated server, while playing back a looped 1080p H.264 movie (the Skyfall trailer) all while running the medium battery life test. The end result is a workload that gives you a good idea of what a heavy multitasking usage model will do in terms of battery life. I've found that OS X tends to fire up the dGPU anyway while running this workload so I saw no reason to run a separate set of numbers for processor and discrete graphics.

Light Workload Battery Life

Our light workload doesn't do much to stress all four cores in the 15-inch rMBP, so that machine effectively behaves like a 13-inch rMBP with a bigger battery. The larger display (more pixels, more power hungry backlight) does consume a bit more power but the 15-inch rMBP manages to last 11% longer on a single charge compared to the 13-inch model. Turn the dGPU on however and the 13-inch rMBP easily outlasts its bigger brother.

Compare the 13-inch rMBP to the 13-inch MacBook Air and you see exactly why the Air isn't getting a Retina Display anytime soon. With only a 50Wh battery, the MacBook Air manages 15% better battery life than the 74Wh 13-inch rMBP. The MBA uses a much lower powered CPU, but I don't know how responsible that is for the difference in battery life here given the very light workload. If I had to guess, I'd say the reason for the difference here is the display and backlight power consumption. What may be more likely than a MacBook Air with Retina Display is some sort of MBA/Retina iPad convergence into some sort of a new device down the road.

Medium Workload Battery Life

Ratchet up the workload and the two rMBPs look very similar in battery life, with the 13-inch model holding onto a 5% advantage. The 13-inch MacBook Air also loses its battery life advantage here as well. Once again if you turn on the dGPU, the 15-inch rMBP blows through its battery much quicker.

Heavy Workload Battery Life

In our heavy test the 13-inch rMBP sets a new record for our new suite, outlasting the 13-inch MBA by 15% (despite having a 48% larger battery). Worst case battery life is much better on the smaller rMBP compared to the 15-inch model thanks to its use of a dual-core processor with no discrete GPU. Performance obviously suffers, but if all you care about is battery life the 13-inch rMBP will do better on a single charge.

GPU Performance Thermals & Acoustics
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  • MrCromulent - Tuesday, November 13, 2012 - link

    Thanks for the thorough review! I was really looking forward to the 13" version of the rMBP as a possible desktop replacement machine for development, but I guess I'm going to pass this year.

    Multi-monitor performance (internal display plus 2 external ones) would be excruciatingly bad, I presume? Or is it acceptable because most of the stuttering seems to be caused by CPU issues instead of a GPU bottleneck?
    Reply
  • Freakie - Tuesday, November 13, 2012 - link

    I would encourage you to pass. This 13" rMBP has COMPLETELY lost it's "Pro" name. Dual-core with no dedicated GPU, only 8GB of RAM, paltry amounts of storage, and a screen that's only good for resolution, not for quality, makes this a stupid choice for any art professional. The thing can't even run a Safari window with Facebook on it without dropping below 30fps! Add the $1,700 price tag to all of this and you have to be out of your mind to buy it. And trying to multi-monitor is going to drive you nuts performance wise.

    And now for a slight rant on the Review it's self:
    "You don't sacrifice display quality at all in the move to the smaller panel. Brightness, contrast and color reproduction are all great."

    This line particularly bugged me, which shows Anand's bias for Apple yet again. Brightness is good, not great, and color reproduction is horrendous. You DO sacrifice a lot in switching to these displays. Artwork on this display is color suicide. And I haven't seen a computer screen have after images like you described in well over 6 years. In my opinion quality has gone WAY down.

    So not only is your built-in display crappy for work, but if you plug another screen in then suddenly you've maxed out your CPU's performance, and that's before you've even started working.

    I'm sorry, Anand, but this entire review seems to dock points off again and again, and yet you still manage to say that it's nearly perfect in your conclusion. While I do appreciate that you've been more forward towards issues on the devices in your Apple reviews as of the last few that you've done, in the end it seems like you just conveniently forget about them and write apologetically about them where as Dustin would, and does, expose all of a laptop's flaws and strengths and does a good job of not sugar coating or glazing over problems. When Dustin sees a machine not living up to what it is supposed to be, he doesn't pull back any punches and calls it out. It seems obvious that this machine is not "Pro" in any way imaginable and I really feel that should have been pointed out.
    Reply
  • guidryp - Tuesday, November 13, 2012 - link

    Nice Rant. Too bad it is nonsense.

    Horrendous color reproduction?

    The screen has the best contrast of any tested and the second best color accuracy. Also this is an IPS screen with superior color stability vs angle of view. Much better than the TN screens that occupy the vast majority of laptops. It is a fantastic screen in terms of resolution, color accuracy, contrast and color stability.

    Image retention is the only real fault and if it was a significant issue, return it.

    As far as it losing "Pro" status for not having quad core/discrete GPU, that is no change, it was like that last year as well. If this is your definition of Pro, I am sure you can find a suitable cheap Dell that has quad core.

    Bottom line. I do think it is probably early to jump to this Retina Model because of potential performance hiccups, and you are better off waiting for a Haswell model. But there is no need to resort to nonsense ranting to state that.
    Reply
  • Freakie - Tuesday, November 13, 2012 - link

    IPS means next to nothing. It's just one small part of the entire range of components and technologies that go into making a good display. IPS is chosen for high resolution displays for different reasons other than color.

    And it's Delta E value gains nothing from being second best, as best is so far ahead of it it's ridiculous. Anandtech's method of obtaining Delta E is taking the best value after repeating the test multiple times, and with how close it is to so many other monitors, and how even a screen being on for 5 minutes versus 10 minutes can affect screen color tests small amounts, it actually isn't that hard to summarize the test results by saying that it essentially has the same color representation as the 5 notebooks behind it.

    And Color Space is VERY important for artwork. It's nice to have a good Delta E but without a wide color space, you're still shooting yourself in the foot and your results will be noticeably inconsistent and will require a lot more fiddling within your editing programs to get right.

    And my definition of Pro is what the MBP used to be, a powerful laptop that could reliably be used for professional work when you aren't at your desk and that sacrificed some weight and size in order to deliver the power that you need. This MBP does not live up to the MBP name and should just be a regular Macbook (but of course they got rid of those and just turned the MBP's into normal Macbooks).

    But no thank you on the Dell :) I wouldn't never own one of their consumer models and their professional models are rather pricey. I'd rather just Build-To-Order a nice ASUS and pay the extra $100 for the 95% NTSC Gamut Matte screen.
    Reply
  • guidryp - Tuesday, November 13, 2012 - link

    95% NTSC screens are just about useless for 99.99% of users.

    We live in an sRGB/Rec. 709 world, and that should be the goal for most screens, and the Retina MBP is very close to this much more important standard. Actually Anand should actually report the sRGB match in his reviews since it is so much more important for most users.

    Wider gamut than sRGB screens simply cause more problems than benefits, causing jarring color inaccuracy as you move back and forth between color managed and non color managed applications.

    It is a fallacy to simply think, a bigger number is always better when it comes to color gamut.
    Reply
  • Freakie - Thursday, November 15, 2012 - link

    It's not for 99.99% of users, MacBook Pro's were meant for professionals, but now because Apple wants more money, they got rid of the regular MacBooks and put crappier hardware in their Pro's. So for the people who buy the Pro's because they need a Pro machine, a 95% NTSC DOES matter.

    And even in the sRBG the Retina displays suck. 64% of AdobeRBG is still below 90% sRBG so it doesn't get any extra points even if you wanted to try to argue that for some reason sRBG is better. And I would disagree that wider than sRBG is problematic, especially when switching between color managed situations. Yes, switching from a non-calibrated screen from a calibrated one is weird if the non-calibrated one sucks, but who cares? The whole point of having the wide gamut, calibrated screen is so that your work comes out correct, not so that your browser window looks right -_-

    And it's not fallacy :P When you're working on something that you're going to print, or display through high resolution means like digital signage or movies on a projector... Those devices and mediums that your are going to be displaying it through will have wide gamuts. Obviously print has a wide gamut, and most digital signage uses the same 32"+ high resolution high gamut displays, and a professional movie projector for films will also have the same. So if you work on your project on an sRBG screen you will be sorry when you see it displayed/printed elsewhere.
    Reply
  • jmelgaard - Thursday, November 15, 2012 - link

    I Seem to be confused here... But you seem to imply that you only belong in the professional segment if you use your computer for graphical work?...

    Damn... And here I thought I used mine for Professional Application Development... BUMMER!... Ill better start looking for another job, one with Pictures and Colors and Gamuts and Colors and OMG my head hurts now...
    Reply
  • WebJester - Tuesday, March 26, 2013 - link

    I see you glossed over the comment about calibration. Reply
  • aguilpa1 - Tuesday, November 13, 2012 - link

    Color reproduction was only part of his reasons for noting that there should be a distinct difference between a Macbook and a MacbookPro. I have to agree with him. The Pro was for Professionals that did not mind the extra weight or size as long as they could get the options and upgrades they needed. The fact that you mention stupidly that maybe he should go get a Dell if he wants a 4 core CPU should slap you in the face as obvious that the MacbookPro is not a Pro if a cheaper model offers what it does not. Reply
  • TEAMSWITCHER - Tuesday, November 13, 2012 - link

    I have been waiting for this review, because I already upgraded from an older 15" dual-core MacBook Pro to this laptop. I did notice the minor "choppiness" when scrolling web pages, but it's not intolerable. I was expecting the HD4000 to be a total dog at 3D. To my surprise it wasn't all bad. To be honest though, I play mostly older games.

    The display is easily...hands down...no questions about it...the best I have ever used. Game over - thank you for playing. Now, when I look at non-retina displays, I immediately notice the difference - and I don't like what I see. I desperately want a 27" Retina Thunderbolt display. Maybe they can add discrete graphics to the display for the best of both worlds. Please Apple, make this happen.

    But where this laptop really shines is it's portability. Having used a 15" Pro laptop for the last eight years, the difference is striking. I was tempted by the 13" MacBook Air, but the grey bezel around the screen felt like a step back from the edge-to-edge glass that I have grown to love. This feels every bit like the Pro Machine I have been using for the last three years. I can't express how comforting it was to drop so much weight, yet retain the same great keyboard, trackpad, quality construction, and performance. Truly an amazing feat and why the "Pro" moniker is deserved.

    This isn't the laptop for everyone, but for me...web browsing, coding, and just always having a great computer at my finger tips...it's pretty close to perfect.
    Reply

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