Intel HD Graphics 2000/2500/3000 Linux 3.13 + Mesa 10.1 Update
With the latest Linux graphics driver code, only the Core i5 2500K and Core i5 3470 of the tested hardware able to run above 30 FPS at 1920 x 1080. Thank god the HD 4000 Ivy Bridge and Haswell graphics are much faster and tend to deliver a much better experience for casual Linux gamers.
The Core i5 2500K "Sandy Bridge" tends to do better than the Core i5 3470 "Ivy Bridge" CPU due to the i5-3470 using the low-end HD 2500 graphics instead of the HD 4000 graphics on the higher-end IVB CPUs.
With Prey at 1920 x 1080 the i5-2500K and i5-3470 were lucky to pass a 30 FPS average.