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Here is my setup:

OS: Windows 8.1 x64 CPU: Intel Core i7-4702MQ @2.2 GHz GPU: Nvidia GTX 750M

Almost 100% of my renders have been done on CPU because every time I try to render on GPU (knowing I'm using auto tile size) I always get a significantly slower render time. I've seen a lot of people recommending GPU for renders as it can take up a chunk of the time required to render. My question is: when is it recommended to use a GPU to render and when is it better to stick to CPU render?

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    $\begingroup$ Grab yourself a better card and you'll get significant faster render times. $\endgroup$ – brockmann Dec 5 '17 at 15:13
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    $\begingroup$ Given that you are using a laptop, you don't have much of a choice to change the GPU. The graphics card that you are using does not have a lot of CUDA cures. $\endgroup$ – cegaton Dec 5 '17 at 15:17
  • $\begingroup$ yeah @cegaton you are right, thats why im saving for a desktop setup, hopefully a month from now and ill get it, cuz render times are growing day after day, i just hit the 41 hours per render lol its frying my laptop. $\endgroup$ – Mario Abou Samra Dec 5 '17 at 15:34
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    $\begingroup$ @MarioAbouSamra I edited your question. In the future, please consider double-checking that you capitalize "I" and the beginnings of sentences, use apostrophes, and follow other simple grammar rules. This will make your questions easier to read! :) $\endgroup$ – R.M Dec 21 '17 at 23:06
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Depends which device has better compute performance. Usually that's GPU in desktops and CPU in non-gaming laptops.

Also you can be baking simulations on CPU and render at the same time using GPU.

Latest 2.79 Blender builds offer rendering on both CPU and GPU at the same time.

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