cpu selection

the diference between
athlon II 615e 2500hz
phenom II 910e 2600hz
apart the 100hz diference
is that phenom has a l3 case?
or is there any other improvements?
if there is only the l3 case
how much does it boost perfomance??
according to passamark athlon scores 2970 and phenom 3108
adding the 100hz diference we see that it has 4%mor ehertz and 3% better score thus according to passmark test l3 does not boost any perfomance.
in what cases the l3 case will make phenom score better than athlon?
thank you

 

any suggestions??