Miles!

That case should be more than enough to keep it cool, the table fan would just be interrupting the air flow

It's trial and error at the moment. 

Normally the case is more than enough, but combine the hot ambient temperature right now, Which includes my room directly facing the sun most of the light day, It's just not living up to it's standard. 99% of the year my room is normal temperature and my PC is fine, but right now it's boiling even with windows open, aircon and fans. The main problem at the moment is hot air inside the case is being exhausted through the radiator which is problematic for the CPU. Normally, It's fine but with this heat it's not working. The front fans are blocked by Hard drives, I have no control over that. My aim at the moment is to take the demand off the radiator and the fan is working perfectly. The fan should also dissipate heat coming off the GPU so that doesn't rise to the radiator anymore either. 

I'm getting a new case soon, with much better airflow as well as more advanced fans waiting for pre-order.