hi
i have laptop version
nvidia 640m LE
the core is 16
the core is 752mhz memory 1569mhz

how much i can overclock using msi afterburn??
i try with 835mhz 1700mhz
seem ok 90celcius for GPU max

i using 8gb dual channel 1600mhz
the voltage cannot be alter

any advice how much i can optimize?