For this testing, the Core i3 2120 performance was compared to an Intel Core i3 2100 and Intel Core i5 2500K. With the lackluster overclocking abilities of the non-K SNB CPUs, all CPUs were running at their stock speeds.
This benchmarking was being done with an ASRock Z68 Pro3 motherboard, 4GB of DDR3 memory, a 60GB OCZ Vertex 2 SSD, and the Intel HD CPU graphics for all three processors. An Ubuntu 11.10 development snapshot was loaded on the system while the Linux 3.1 Git kernel was manually loaded up along with xf86-video-intel 2.16 Git and Mesa 7.12-devel as of git-8f4ec55.
Benchmarking was done via the Phoronix Test Suite and the results stored on OpenBenchmarking.org. This is another article using the recently implemented embedded graphs. SVG versions of all the results should be served, if you are in a supported browser, otherwise there's a PNG fallback. If you experience issues seeing any of the results, let us know.