New Acer Aspire V Nitro series

Discussion in 'Acer' started by G-Force, Aug 13, 2014.

  1. Che0063

    Che0063 Notebook Enthusiast

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    I'd say its about the evolution of CPUs and Laptop Designs.

    laptops a few decades ago, as I understand it, had CPus that merely sipped power. Even desktop CPUs barely cracked 45W until the days of Core 2 and Pentium 4 under stock speeds. Nevertheless, their cooling solution was not very quiet. But the main thing was that CPUs had a constant clock speed, and here's merely an example

    So you've got a 1 GHz CPU in a laptop in the 2000s That CPU will likely constantly run at 1GHz, and even if there was some energy saving procedure it would only go down to, say, 450 MHz. Now the idle power consumption is 10W on idle, and if you put it on load it might simply rise to 15W; therefore the cooling solution only has a narrow range of power/heat it has to dissipate.

    Modern mobile CPUs, however, have an extremely wide thermal output range. Take the HQ 45W Intel Core CPus, for example. They idle at about 1-2W, but on full load they can reach 50W. Not only does that necessitate a more powerful cooling solution, but the laws of thermodynamics haven't suddenly changed. They've remained the same. Sure, there have been advances in cooling techniques, but it now means that CPUs run at both cooler and hotter temperatures

    Now I have the i7-6500U in my laptop, which is a 15W chip. Simply tying this my CPU uses 2W of power. The ambient temperature in my room is 12C, and the CPU is at 25C. At idle, it should be noted that clock speeds are irrelevant; modern CPUs have a wide range of C States, and during a proper idle a large percentage of transisters or whatever in the CPU are turned off, receiving literally 0 volts. I've run the LinX CPU benchmark and my CPU reaches 21W of power. Not only this but the temperature almost instantly rises by 20C, quickly climbing to +30C, and in the end stabilizing at 90C with no throttling. If I ran it now, that is a 60C temperature difference!


    I just wanted to ask you a question, Beem Boom

    I wasn't aware that the risks of joint failure caused by temperature was so high. Thanks for worrying me about it now :)

    I keep my laptop running almost 24/7, but I tend to take care of it. Here's what I normally do with my laptop:

    7am: Ambient Temp: 10C. CPU Temp 20C
    I then run 2 VMs s in the background and sdo some other rather resource intensive task, and the CPU ruses and stabilizes to 60C after about 10-20 minutes. The CPU stays at a constant range of 50-65C through out the day, only dropping after 12-15 hours. After that, it drops to 40C quickly, then cools down to 25C after half an hour and I wake up the next day with the temperature at 20C or so


    So essentially my laptop is going through one cycle of heating and then cooling, per day. Will this affect the lifespan of my laptop? I really hope it lasts 10 years for me
     
  2. Beem Boom

    Beem Boom Notebook Enthusiast

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    @Che0063

    I think you have nothing to worry about, thermal gradient 20~60°C are not so terrible. For comparison: my CPU's TDP is 47 W, the peak is 60 W, plus the video card adds 45 W, and the temperature in the games was 85-90°C before modding. That's why I'm worried. :)

    I think, replacement of thermal paste would not hurt your laptop, but it is not necessary. This, most probably, will reduce the speed of temperature changes and reduce the peak temp on max load. But you should do it only if you are good at it. Otherwise, the temperature may even increase. An example of unsuccessful repasting was posted earlier in this topic:
    http://forum.notebookreview.com/threads/new-acer-aspire-v-nitro-series.759420/page-195#post-10164424
     
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