Render times for Blender 2.79

My time:
CPU: Intel i7 2.70Ghz
Installed RAM: 16.0 (15.9 GB usable)
GPU: Nvidia Geforce GTX 675MX 4 GB GDDR5 RAM
OS: Windows 10 Pro 64bit

Resolution ---------------------------------
X: 1920 px
Y: 1080 px

Tiles
X: 64
Y: 64

Time: 7 min 28.30 seconds (GPU - CUDA)
Time: 4 min 53.84 seconds (CPU)

Resolution ---------------------------------
X: 1920 px
Y: 1080 px

Tiles
X: 128
Y: 128

Time: 5 min 23.09 seconds (GPU - CUDA)
Time: 5 min 19.03 seconds (CPU)

Resolution ---------------------------------
X: 1920 px
Y: 1080 px

Tiles
X: 256
Y: 256

Time: 7 min 57.44 seconds (GPU - CUDA)
Time: 5 min 39.03 seconds (CPU)

Resolution ---------------------------------
X: 1920 px
Y: 1080 px

Tiles
X: 512
Y: 512

Time: 4 min 43.10 seconds (GPU - CUDA)
Time: 14 min 30.09 seconds (CPU)

GPU vs CPU Render times is that during CPU rendering.
The CPU runs hot while the GPU runs cool. While the render
time may be shorter with the CPU. On my laptop I feel that I run
the risk of a CPU burnout and damaging my system.

Now I am looking into a laptop cooling pad for a 17inch gaming laptop.

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