Phoronix is continuing to test the performance of open source Linux drivers on Source Engine games with this installation focusing on the performance of the Haswell i7-4770K.  They compare it to a number of RV770 based AMD GPUs as well as the newer HD 6450.  As you can see in the result the performance of the HD 6450 and HD 4550 are almost exactly the same and are the only two Radeons that do not leave the Intel's GPU in the dust.  If you have experience with the HD 4650 you have a very good idea as to how Intel's 4600 performs as the results are very similar.  Check out the full review here.

"Earlier this week I delivered some 13-way AMD open-source Linux GPU benchmarks when tested against Valve's Source Engine powered Team Fortress 2 and Counter-Strike: Source games. Now up for testing from the Steam Linux client on Ubuntu is the Intel open-source Mesa graphics driver performance with Core i7 "Haswell" graphics."

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