Best location for a PWM fan?

[probedb]

With this heat I started looking at better fans for my PC and discovered it has a second PWM header on my mobo, as well as the CPU fan.

Where would be best to locate this? I can do rear fan or one of two front fans? I've never used them for anything other than the CPU before.

Cheers
Paul.

 

[probedb]

Thanks. I think I'll try the front of the case to start with in that case