I think it would be faster to render with my gpu, but I can't seem to select it.
My GPU is an MSI gtx 1050 ti
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Press ctrl + alt + u to open the "User Preferences".
Switch to the "System" tab and change your compute device.
(I do not have a compatible GPU, but yours should show up here, if it is compatible.)
I recommend clicking "Save User Settings" so that this is saved for next time you open a new Blender file.
Your GPU should now appear under the GPU compute section.