They all do, in fact the GPU is required to boot the CPU. In your free output it is clear that 64MB is assigned to the GPU, as per default, because it says you

They all do, in fact the GPU is required to boot the CPU. In your free output it is clear that 64MB is assigned to the GPU, as per default, because it says you only have 432M total (available to the CPU). You can gain most (not all) of that 64MB back for free, simply by running `echo gpu_mem=1 | sudo tee -a /boot/config.txt && sudo reboot` (Pretty sure that the minimum is actually more than 1, but also that it will accept that and set it to the minimum... check the docs if you need to be sure)