help me to choose between them...laptop

the final 2 configurations are

common things....
15.5 " screen

1) sony
core i5-2450 2nd gen processor
4gb ram
2gb ati 7650 ddr3 gpu
640 gb hdd
rs.48010

and

2)lenovo

core i5-3210 (3rd gen processor)
4gb ram
2gb nvidia gt 630M gpu
500 gb hdd
rs 47990


my usage is for gaming software with some high end perforamnces...
my budget is 45+3to 4 k

please reply soon...