rMBP Fans Blasting During Video

Discussion in 'MacBook Pro' started by Squilly, Apr 4, 2013.

  1. Squilly macrumors 68020


    Nov 17, 2012
    I was just watching a video online and what do you know... my fans started blasting out of nowhere - to their max speeds. This was 2 minutes ago, after I updated it to the latest version of Lion (supposedly without the fan problems). As I'm typing this, the speeds are going down, but find it quite odd that they shot up out of nowhere.
  2. GGJstudios macrumors Westmere


    May 16, 2008
    Watching videos or other resource-intensive processes will drive up system temps and cause fans to speed up. It's quite normal.

    If you're not already doing so, use iStat Pro (free) or iStat Menus ($16) to get accurate readings of your temps, fan speeds, etc., rather than relying on your sense of touch or sound. A forum member has posted a copy of iStat Pro that has been "tweaked" to enhance compatibility with Mountain Lion. You can download it here.

    The Intel processors used in Macs are designed to automatically shut down to prevent damage if they truly overheat. CPU Tjmax = 105C (221F), GPU Tjmax = 100C (212F) on i3, i5, i7 processors. (Source: Intel)

    Unless there is a rare defect in a Mac, most temps are well within the normal operating range, considering the workload being put on it. Websites with Flash content, games and other multimedia apps will put higher demand on the CPU/GPU, generating more heat. This is normal. If you're constantly putting high demands on your system, such as gaming or other multimedia tasks, expect temps to rise and fans to spin up accordingly. It's just your Mac doing its job to maintain temps within the normal range.

    It is also quite normal for your Mac to become extremely hot to the touch during intensive operations. The aluminum body transfers heat more effectively than other materials used in computer casings, so you will feel the heat more. This doesn't indicate that it's overheating and will not harm the computer to be hot to the touch.

    Your fans are always on when your Mac is on, spinning at a minimum of 2000 rpm (for MBPs) or 1800 rpm (for MBAs, MBs and minis). iMacs have 3 fans with minimum speeds in the 800-1200 range. They will spin faster as needed to keep temps at a safe level.

    If your fans are spinning up without increased heat, try resetting the SMC.
    (PRAM/NVRAM has nothing to do with these issues, so resetting it will not help.)

    The intake and exhaust vents are in the back of the computer near the hinge on all Mac notebooks (except the new MBP with retina display, which has intake vents along the sides at the bottom). The iMac vent is a slot on the back near the top of the computer. Make sure the vents remain unblocked to allow your computer to perform at its best.

    Learn about the fans in your Mac
    Apple Portables: Operating temperature

    For Flash-related issues:
  3. cullenl87 macrumors member

    Aug 24, 2012
    Fan Noise

    I've just had some serious fan noise in the left side of my rMBP. I'm sending it in to get fixed before my warranty runs out.

    I took it to a local Mac repairman and he opened it up to see what was going on. I thought it might be a dirty fan or something. He blasted it clean with air and then we spun it with our fingers and the noise persisted.

    It sounds like an old floppy drive being read and it's pretty annoying. I've dodged doing major work on the laptop to keep the noise down. I'd advise sending it in to Apple or taking it to a local Mac Shop before your warranty is done.
  4. xShane macrumors 6502a


    Nov 2, 2012
    United States
    Sounds like typical Flash. Not much you can really do about it if so.

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