Intel Core i3 2100 Sandy Bridge
In Bullet Physics and many other tests, the Core i3 2100 falls right in the middle between a Core i3 530 and Core i5 2500K.
With C-Ray, the Core i5 2500K is more than twice as fast as the Core i3 2100 of the same family.
As POV-Ray 3.6 is not multi-threaded, the results between the i3-2100 and i5-2500K are much closer in this test than C-Ray.