Intel Haswell HD Graphics 4600 Performance On Ubuntu Linux
For the defunct Nexuiz game, Haswell was about 20% faster than Ivy Bridge with the current latest Haswell graphics driver.
With the OpenArena 0.8.8 game, there was only a slight frame-rate advantage to the new Intel CPU. However, OpenArena 0.8.8 isn't one of the most interesting OpenGL Linux gaming benchmarks.
Reaction Quake 3 was about 16% faster with the Intel Core i7 4770K over the i7 3770K.