that “pi2” overclock setting is also pretty aggressive. i’d suggest toning it down until you’ve got a stable system – should be able to run all snes and PSX games without major issue on a default pi2.

if you want to overclock later i’d suggest following some of the reported ‘stable’ configs here: http://linuxonflash.blogspot.co.uk/2015/02/a-look-at-raspberry-pi-2-performance.html