Cars side view
(First render: 9:12:37) CPU
(Second render: 27:02.70) GPU
No difference
Hubcap view
(First render: 13:46.09) CPU
(Second render: 55 minutes) GPU
Unfortunately all of the renders are a bit blurry.
My specs for rendering:
CPU: Intel Core i3-4130 CPU @ 3.4Ghz
GPU: GeForce GT 610
RAM: 12GB
OS: Windows 10 64 bit