4.1 ghz to 4.5ghz is there a big difference

i recently overclocked my 6100 using the AI suite II
i used the auto tune [extreme], and with just a single click
my CPU increased from 3.3 ghz to 4125 mhz (4.1ghz)
i was surprised by the overclocking feature this utility has given me

i read a lot of forum that they can get their 6100 to 4.4 to 4.5 stable
now my question, is the extra 300 to 400 mhz has big impact
on performance?

(btw im only running under stock cooling 4.1ghz steady at 60deg)

if there is really a big difference, can you please teach how to
reach 4.5 ghz (i'll buy hyper evo 212 if necessary to increase to 4.5 ghz)

PC specs
mobo: Asus M5A97
CPU: FX 6100
RAM: Gskill Sniper 2x4g (1600mhz)

(with all due respect to all who'll read this, please answer only
within the topic, no sell this buy this recommendation  
i'll already accepted the frustrating truth that i bought a slow cpu)