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CPU replacement for lenovo g50-70

Nope. You can't upgrade processors on laptops as the motherboards don't support this. Look at a ram upgrade, or an ssd, or a new laptop.
 
Of course you can upgrade it:)Here is the most powerful CPU for this notebook-4th Gen Intel® Core® i7-4510U (2.00GHz 1600 MHz 4MB) and also RAM up to 16GB DDR3L,SODIMM keep attention on `L` letter its means that you using lower voltage ram modules only.
Best Regards,
Terziev Georgi