It must be my simple mind, but I understand the following:
- CPU: 0%, meaning the CPU is not used.
- CPU: 100%, meaning the CPU is fully used.
Can you explain how it is possible to use more than 100% of the CPU?
If you have $ 100 cash in your pocket, how can you pay in cash more than $ 100. That makes no sense to me. I would love to hear how you can pay in cash say $ 700 when you only have $ 100.
well ok, since the macbook pro i7 processor has 4 physical cores that have each a "virtual" twin, that makes 8 cores that all go from 0 to 100%.
Following me? So if the activity monitor indicates 700% (which it does, i swear), that means all the cores are almost used up to 100%.
If i do the math, that's about 87-90% of the total power of my mac put all together.
Hope this helps in understanding.
OK, that is clear. Now, using around 90% of the CPU sounds great to me. I mean, that is the reason to use a 4-core with HT, isn't it. Otherwise, if the CPU were only used for say 25%, a single core CPU would suffice and saved a lot of money. The sound of the fans is design choice by Apple.
Exporting is done by the CPU, so with a 90% load that is a good figure. It would be worrisome it the load were only 25%, because then other components would be slow delivering data to the CPU. That is not the case.
ok, well yes that totally makes sense, after all rendering is super fast and efficient, it just doesn't "sound" healthy for the computer. Nor "feel" healthy due to a lot of heat. But if it's the "design" i guess there's nothing to do about it.
I just hope that it won't crash when exporting much heavier footage (per example 14 bit raw 5d clips, or 4k... or whatever).
Thanks for your replies by the way.
Rendering will always use the extent of the hardware CPU resources available unless limited by any specific hardware components or software components such as codecs or FX. When you have your system pushing 90%+ then that mean the editing application is rendering ideal for that system. However laptops with thin profiles are not really designed for that kind of heat generation over long period of time. Due to the size of the laptop shells themselves they have the cooling efficiency close to the edge of what it needs to be to maintain temps under thermal shutdown so they use CPU C states and throttling to keep the temps from continuing to build up on the CPU package. Those throttling profiles normally engage around 90C or 91C and slot the chips down drawing less power generating less heat. it works but eventually you can thermal burn a mobile chip if you do that for 10+Hours at a time most days of the week. Over time the cooling efficiency of the heatsink and fan drop as well which increases this likelihood. Keep that in mind if you don't have a desktop to render on more than the laptop.