I am not really sure. For me GPU frequency increasing always gives me the best boost, at least this is how it looks like to me.
At the moment I am on 1996 MHz Ram, 1175 EMC Vdd2, 0 mV EMC DVB Shift, DRAM Timing 0 and 0 for all other timings.
For demanding games like FC 24 with 60 FPS I get...