i see that you bought an athlon 750k, that's an unlocked cpu (may be you had o.c. in mind?). if you o.c., the tx3 will not be adequate as it is smaller, and the fan(s) will get louder to dissipate the extra heat.
a more expensive closed loop liquid cooler might be more suitable for overclocking, like corsair h75/h80i. amd overclockers will be able to provide better adviceon this.