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Not everything needs to be overclocked to see a big difference, the i5 at 3.7 will be a big upgrade over the Pentium especially in CPU intensive game like BF1 online. His mobo does not support overclocking so a k chips is a waste.
The motherboard does support of with the g3258, multiplier and voltage.
Would this no longer be available if I did splash on a K sku i5?