Done for 2009: The Holiday MacBook Pro Roundup
by Anand Lal Shimpi on November 10, 2009 12:00 AM EST- Posted in
- Mac
Still Better Battery Life Than Windows 7
Other than running Safari in 64-bit mode, the best way to hurt battery life on your MacBook Pro is to throw Windows 7 on it. I've pointed OS X's battery life advantages out before, but this is one of those things that's difficult to compare since there's only one brand of computer that runs OS X.
The best reference point I've got is still my old Thinkpad X300. It has a similar configuration in terms of battery capacity and CPU power draw to the MacBook Air, yet gets about half the battery life under Windows Vista as the Air did under OS X. Put them both under Vista and they are quite similar.
I ran a few more tests with the MacBook Pro under Windows 7 to see what the final tally was. Apparently the latest version of Boot Camp improves Windows 7 battery life, but I like having numbers to back up unverified claims.
I ran two tests under Windows 7, our light wireless web browsing test and our XviD playback test. The reason I chose these two is simple: I wanted one where the system spent a good amount of time in an idle state (up to 20 seconds between web page loads in the web browsing test) and another where the system was constantly busy (with no hardware XviD offload, the CPU has much less downtime).
Windows 7 was configured to maximize battery life, running in its power saving mode. Unlike the test I ran in the last review, I used IE8 and Windows Media Player 11 in Windows 7 while I used Safari/iTunes in OS X. The results I got were both expected and quite revealing:
| 13-inch MBP Battery Life | OS X 10.6.1 "Snow Leopard" | Windows 7 x64 | OS X Advantage |
| Light Web Browsing | 468 minutes | 263 minutes | 77.9% |
| XviD Playback | 207 minutes | 198 minutes | 4.5% |
The light wireless web browsing test echoed what I'd seen previously: OS X is better for battery life when it comes to lots of idle time (from the CPU's perspective). But look at the XviD results, the two OSes last the same amount of time.
These results appear to confirm what I'd suspected; throw enough load on the system and the OS X advantage is negligible. Keep it light and with enough idle time and you'll find OS X pull ahead. Jarred has seen similar results. One of his battery life tests involves leaving the laptop idle at the Windows desktop until it shuts off. None of his laptops have ever been able to match the battery life of the MacBook Pro in my light wireless web test.
Ultimately Apple still uses the same hardware as PC notebook manufacturers, so under load its systems shouldn't really consume any less power. But at idle Apple has much more control over the OS and drivers than a Dell or HP, the result appears to be better idle battery life. For light usage or working with a lot of pauses or downtime, OS X just lasts longer.
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ltcommanderdata - Tuesday, November 10, 2009 - link
I believe Anand did comment on screen resolution on page 4 where he found the 15" resolution just right for the screen between space and not being an eyestrain. Personally, I agree that 1440x900 on a 15" screen is about right. I've found 1680x1050 on a 15" screen to be a bit too dense. Although that just brings up Apple's lack of progress on resolution independence which has been in development since Tiger.On the topic of screens, I wonder what are the chances that Apple will move to 16:9 screens as on the iMac and as other notebook manufacturers are doing. I hope not as 16:10 is wide enough and it's not like watching movies is the only thing people do on their laptops. Besides, for the creative industry users working on 16:9 content, 16:10 screens should make sense to leave room for toolbars and such for editing.
secretanchitman - Tuesday, November 10, 2009 - link
agreed. 1680x1050 on the 15" would be absolutely perfect. i would rather have 16:10 rather than 16:9.i would also love to see core i5/core i7 (doubtful on core i7 though), a much faster gpu (next gen nvidia/ati), and the expresscard slot to make a return as an option. also, most of all, PLEASE make sure the matte screen and silver bezel return!
darwinosx - Tuesday, November 10, 2009 - link
I like the current resolution. Anything higher would be too high for me.ltcommanderdata - Tuesday, November 10, 2009 - link
I don't know exactly how it works, but I've read before that 64-bit Safari is able to use a 32-bit Flash plugin through InterProcess Communications (IPC). Presumably, this causes more overhead and the 32-bit Flash plugin wasn't designed/optimized for this in mind, so that could explain why battery life is so poor under 64-bit Safari with Flash.In terms of Macs, I have to agree that qualities like battery life, weight, look, and feel are things that can be worth paying extra for even if they are harder to definitively measure and compare.
I wonder what Apple is going to do about the IGP situation when they move to Arrandale? It definitely seems strange that nVidia's CEO picks now of all times to advertise his love for Macs after ATI pushed nVidia out for discrete GPUs for the iMacs and on the eve of Arrandale's IGP and DMI link. Presumably Apple could consider using switchable graphics between Arrandale's IGP and discrete GPUs even for low-end models. The effort put into Intel IGP drivers in Snow Leopard bringing the GMA X3100 up from OpenGL 1.2 support in Leopard to OpenGL 2.0 support seems to indicate a readiness of Intel IGPs. It will of course force the introduction of another chip on the motherboard, which is a concern for the space constrained 13" MacBook Pro.
If Intel won't license DMI to nVidia, I wonder if Intel would license it to their good buddy Apple. Apple could then license nVidia graphics technology to serve as the IGP for their own custom chipset. Apple used to design their own chipsets in the PowerPC days and certainly have the resources to do so now with the P.A. Semi team. Besides a better IGP, a custom chipset would also allow Apple to integrate functionality currently done by external chips like Firewire controllers and the multi touch touchpad controller as well as adopt new technologies like USB 3.0 and Lightpeak without waiting on Intel. I believe Jobs did say in a previous conference call their intention to differentiate themselves by offering technology that no one else has and this is certainly one way to do it.
This article seems to mention Arrandale a lot as the future processor of the MacBook Pro, but hopefully Clarksfield will also be available on the 17" and high-end 15" models. Clarksfield clock speeds are disappointing though (1.6GHz - 2GHz) so it'll be interesting to see how Apple plays it.
JarredWalton - Tuesday, November 10, 2009 - link
Clarksfield is a power hog, and there's no getting around that. I've got an i7-720QM based laptop and if I use absolutely minimal performance settings (CPU at 0%, HDD turn off at 1 minute, DVD and webcam turned off when on battery) I barely get 90 minutes of battery life with a 55Wh battery.I can't imagine Apple will ever use Clarksfield in a laptop, because they are targeting mobile battery life far more than mobile performance. Frankly, even the top-end 17" MacBook Pro is pretty weak in many of the performance areas we'd look at on Windows. A 9600M GPU is nothing to write home about -- 32 SPs is what we had back in the days of the GeForce 8600. OS X seems more dependent on CPU, though.
I'm also curious about which CPUs Apple is using; previously they used the SL9000 and SP9000 I'm pretty sure, but now it looks like they're using standard P8000, P9000 and even T9000 parts (though only on the 15" and 17" for the T9000 I'm sure). Maybe Anand can say which specific CPUs are in the Macs now.
ltcommanderdata - Tuesday, November 10, 2009 - link
I didn't know Clarksfield battery life was so bad at idle/light usage. I thought that peak power consumption would be higher, but idle/light power would be comparable or better then high-end mobile Core 2 Duos due to the Power Control Unit. I guess Clarksfield could serve as the real test of Apple's power management abilities. Although with Anand finding that a MacBook Pro gets 78% better battery life in OS X than Windows 7, and a 17" MacBook Pro having a 95Wh battery compared to your 55Wh battery, if you get 90 minutes with the i7-720QM, Apple could get around 4.6hrs in OS X on a 17" MacBook Pro with that processor which is okay. Although Clarksfield would probably be limited to BTO only to avoid confusion.And I agree that Apple's GPU choices are generally questionable, especially seeing OS X's heavy reliance on the GPU starting with Quartz Extreme acceleration in Jaguar in 2002, Core Image in Tiger in 2005, and now OpenCL in Snow Leopard. I guess the only small consolation is that Apple always uses at least GDDR3 with their GPUs, even low end ones like the HD2400XT in the iMac, and doesn't resort to advertising high VRAM capacities and then sneaking in low clock speed DDR2. Hopefully, Apple's notebook refresh jumps directly to DX11 GPUs, presumably ATI since they seem to be first out of the gate. Preferably, they will go with a high mid-range GPU, although I guess heat and power and always Apple's concerns in a 1" case.
darwinosx - Tuesday, November 10, 2009 - link
OS X is not "dependent" on cpu but it can use the cpu for things other than standard vid card work.dagamer34 - Tuesday, November 10, 2009 - link
Clarksfield is a 45W CPU, which Apple will never use due to heat concerns.I'm really hoping that Apple changes the screen to a 16:9 ratio, which would be perfect for watching HD content. Something like: 1366x768 for the 13", 1680x950 for the 15" and 1920x1080 for the 17" would be a great improvement.
kapute - Wednesday, November 11, 2009 - link
16:9 screen ratio is terrible idea for laptops. Ok for watching movies but not when using a word-processor as all the tool bars etc diminish vertical space leaving a tiny letter box to type in. Better to have black bars top and bottom when watching a movie and more vertical space for everything else.ltcommanderdata - Tuesday, November 10, 2009 - link
Well, I'm pretty sure Apple's top end CPUs like the 2.8GHz Core 2 Duo and 3GHz BTO in the high-end 15" and 17" MacBook Pros are 35W TDP processors. The PM55 northbridge has a 7W TDP. It's hard to isolate a comparison to the 9400M chipset since it has both northbridge and southbridge integrated. Still, 35W CPU + ~7W for a northbridge compared to 45W for an integrated CPU + NB in Clarksfield doesn't seem unreasonable, from a heat dissipation perspective.