Intel X79 Core i7 4960X Review
OpenGL performance has increased massively thanks the extra PCI Express 3.0 lanes that are part of the Ivy Bridge-E CPU. We'd expect them to be equal as we're only running a single GPU, but there is no denying the result. CPU rendering is slightly better on the old chip at stock, but again when they are overclocked the difference is negligible.
Similar to our cryptography test, POV-Ray shows why you shouldn't rely on a single benchmark. Regardless of whether we're at stock speeds or overclocked, the i7-3960X has the better performance. It's only a hairs breadth, but it's there.