Fan, power consumption etc

Hello everyone. I am thinking about buying a 2012 MacBook Air to replace my 2011 one however I have one or two questions which I hope someone would be kind enough to answer for me...
If I was to do exactly the same tasks on the more powerful 2012 one as I do on my current 2011 MacBook Air, would it be cooler and with less fan noise and battery drain? What I mean is, I know the 2012 thing is more or less the same physically, just with some upgraded internals. So, would that mean that the more powerful components of the 2012 MacBook Air would not have to work as hard as the ones in my 2011 MacBook thus generating less heat and drinking less from the battery? I don't know a lot about computers, this was just my logic which is probably completely wrong...
Also, if I upgrade the processor to i7 and RAM to 8GB I am assuming it keeps the same fan and battery...do these more powerful innards have any detrimental effects compared to those of an "off the shelf" model?
In case anyone needed or wanted to know or if it helps you to answer more accurately, my current MacBook is the standard 2011 13" 256GB model. The one I'm planning on getting is the equivalent 2012 model but with upgraded processor and RAM.
Thanks a lot!

The hardware in the MacBook Air in terms of the fan and battery are identical in all the models of the same generation (Mid-2012), there's no change if you order more RAM or the faster CPU. That being said, I haven't seen a lot of technical documentation via Intel's site or CPU "fansites" that have really done thorough testing on the new CPUs.
Engadget's initial review (http://www.engadget.com/2012/06/18/macbook-air-review/) saw a 1 hour and 2 minute increase in battery life, this coming from the same 50-watt hour battery. So take that for it's worth on decreased power draw or improved circuitry components.
Last year I ran a test between two 11" MacBook Airs, one with 2GB of RAM and the slower CPU, the other with 4GB of RAM and the upgraded CPU in conjunction with the CS department. Both machines ran just as hot, drew just as much as power and their fans were equally as noisy under identical sustained load.
I should have access to a 13" model with an i7 and 8GB of RAM next week and I'm happy to run any testing for you to help with your decision making process. Based on the initial feedback that I've gotten from my co-worker who has the 13" model with 8GB of RAM and the standard CPU he's noticed about 40 to 45 minutes of extra battery life and identical fan noise and heat when he's been working in Photoshop & InDesign.

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    system auxiliary connector power limit = 10500.00 Watts (250.00 Amps @ 42V)
    system primary power used =              2253.72 Watts (53.66 Amps @ 42V)
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    C6509Test#
    *Jan 22 09:37:22.317: %C6KPWR-SP-4-INPUTCHANGE: Power supply 2 input has changed
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    *Jan 22 09:38:58.523: %C6KPWR-SP-4-PSOK: power supply 1 turned on.
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    C6509Test#
    Step 4. I used the current clamp to measure the current on the remaining power input and it reads 4.9 A.
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    Thank you in advance for any help on this,
    Marin

    marin_otto.
    Where are you located and what AC line voltage are you operating on (208 or 230v)?  I ran into your post and was wondering if you were operating on 208v which is line to line (two hots) and perhaps you are only measuring current on one line, effectively half the power.
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    Really?  Do you have measured data which clearly supports your claims, or are you just holding up an opinion as a matter of fact?
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    Thinkpad T400 (Windows 7 Ultimate x64)

  • [SOLVED] Huge power consumption after kernel upgrade.

    Dear All,
    I have recently bought the new lenovo thinkpad X1 equipped with a Core I5 processors and 4GB of RAM.
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    C1 mwait 0.2ms ( 0.1%) 2.21 Ghz 0.0%
    C2 mwait 0.3ms ( 0.0%) 1200 Mhz 0.1%
    C3 mwait 2.4ms ( 0.0%) 800 Mhz 99.8%
    C4 mwait 13.1ms (94.6%)
    Wakeups-from-idle per second : 76.1 interval: 3.0s
    Power usage (ACPI estimate): 15.7W (2.8 hours)
    Top causes for wakeups:
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    17.7% ( 51.7) PS/2 keyboard/mouse/touchpad interrupt
    11.9% ( 34.7) [kernel scheduler] Load balancing tick
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    2.9% ( 8.3) [i915] <interrupt>
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    0.3% ( 1.0) Terminal
    0.3% ( 1.0) [kernel core] tpt_trig_timer (tpt_trig_timer)
    0.2% ( 0.7) [mmc0, mei, ehci_hcd:usb3] <interrupt>
    0.2% ( 0.7) upowerd
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    0.1% ( 0.3) wicd-client
    0.1% ( 0.3) kworker/u:3
    0.1% ( 0.3) watchdog/0
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    As far as I'm concerned, the kworker process is responsible most of the wakeups. 
    Any ideas?
    Last edited by jacopo_c (2011-09-05 13:12:16)

    pogeymanz wrote:I read somewhere that the kernel devs really don't see this as an issue. They just expect that laptop owners should know to try these boot parameters. So, definitely not by 3.1.
    from https://bugzilla.redhat.com/show_bug.cgi?id=727579:
    Dave Jones 2011-08-03 15:32:21 EDT
    enabling it by default in 3.0 caused regressions for some people, so it was
    disabled. Hopefully Intel figures it out, and we can switch it back on by
    default in 3.1 / 2.6.41 (until then, you'll have to set it by hand).
    Interesting stuff, also recommend this thread on phoronix:
    http://phoronix.com/forums/showthread.p … Regression
    Last edited by masteryod (2011-09-12 00:30:00)

  • I915 power consumption issue after switch to systemd?

    After switching to systemd I noticed a massive increase of power consumption on my Thinkpad X220 (i5 Sandy Bridge).
    The strange thing is, that after some reboots it randomly seems to catch the i915 power saving mode and the consumption gets from ~24W to ~7W at idle. But only after several reboots.
    Adding the good old i915.i915_enable_rc6=1 to the boot parameters doesn't make any differences. But looking at the powertop detail outputs it seems to be a i915 issue.
    Using the latest linux kernel from core (3.6.4) and latest intel drivers (2.20.12).

    I started to get suspicious because I have only ever had the issue in my office. Last week, when I encrypted my drive, my machine wrote to disk for more than 14 hours solid. I then did all the set up and all the restoring from backup etc. with no issue whatsoever. Lenovo ran the thing for 48 hours straight with no problem. But once in my office...
    So I asked the local IT people if they could think of anything other than overheating and explained the issue. They took my laptop yesterday , booted it from a hardware testing CD and ran it for a couple of hours sitting on top of a hot computer in the server room which is definitely hot. (It has a whole bunch of computers, I guess.) No issue. They then ran stress tests for a while in the same place. No problem. Highest recorded temp: 65C.
    The head of IT then took my power adapter to a more general IT service to be tested and inspected. They looked at it, they opened the plug to check the fuse, they tested it. No problem. Of course, the guy also explained why he was asking and the other IT person said, "Oh, is that on level 1?" "Yes..." So apparently there was another machine (a Mac), I think, doing just the same thing in an office in my part of the building. Testing showed that the power spikes and when the power spikes, the laptop shut down as a safety measure. Solution: they installed a UPS for that one laptop. They didn't tell anybody else, including the local IT people.
    What the local IT people were going to do was to install equipment to monitor the power in my office and see if anything weird was causing my laptop to react. However, that was when this was an extremely-unlikely-but-we-are-getting-desperate-for-theories scenario. Clearly, that theory no longer seems wildly implausible at all. So the current hypothesis is that it is most likely that my machine is also reacting to the spikes in power by shutting itself off. (I'm not sure why it should have just started doing this but who knows what the state of the electricals is and how that might vary?)
    I have been told that a surge protector will do no good. (They've given me one anyway but apparently it will not deal with spikes in phase 3 power or something - I didn't understand this bit but the head IT person said he didn't understand it either but the electricals IT person showed him with graphs on the whiteboard. So it must be true.)
    The current plan is to try to get the UPS from central IT which was provided for the other laptop since that person's discipline has since moved to another floor of the building so the UPS probably went back to central IT. They are going to ask during a meeting tomorrow about this possibility. Otherwise, they are planning to order a UPS for me on Monday.
    I'm somewhat surprised that the abrupt shutdowns haven't screwed my data. I've lost work but not seen fs corruption. I didn't take my laptop today. I'll need it next week but I do not plan to plug it in in my office until I have a UPS.
    I'm pretty annoyed, to be honest. I've wasted hours on this and got incredibly stressed about it. The IT people have also wasted a (smaller) amount of time. I hoped to have a new draft of an article I'm working on written by the end of reading week but that didn't happen due to all of this. And they *knew*. It would be different if this was an unknown problem just discovered - of course, one could understand that. But there's a known problem which can cause this type of problem and presumably could well damage equipment without these sorts of safety shutdown features and they don't tell anybody.
    And, no, I doubt very much indeed that a damaged personal machine would be considered the institution's liability. (Maybe if it was a student's machine and the student was required to use it or something but even then...)
    I can't believe it does much good to their equipment either.
    The local IT people did know there was an issue with some burnt out devices but that was about eight years ago and only got mentioned as a outside possibility when other diagnostics turned up no result.
    What gets me is that the proposed solution will only solve the issue for me - not for anybody else in my part of the building on level 1.

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    I know you were looking for a customized kernel that reduces power consumption but have you looked at https://wiki.archlinux.org/index.php/Laptop_Mode_Tools ?

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