Lenovo E420 Upgrade CPU

[sardinesrule]

I have an Lenovo e420 and am looking to upgrade it's CPU.
I currently have an i5-2410m and am looking to upgrade to something a little better, preferably one with an HD 4000?
I've confirmed that I can upgrade this CPU.

 

[iceclock]

2nd Generation Intel® Core™ i3-2350M processor (2.30GHz, 3MB L3 Cache)
2nd Generation Intel® Core™ i3-2310M Processor (2.10GHz, 3MB L3 Cache)
2nd Generation Intel® Core™ i5-2450M Processor (2.50GHz, 3MB L3 Cache)
2nd Generation Intel® Core™ i5-2520M Processor (2.50GHz, 3MB L3 Cache)

does are the only cpu it supports so theres no point here.