Query this computer motherboard is HM65 chipset, support to replace to the same generation (second generation i series processor) higher performance processor, such as i5 2430M, i5 2450M, etc., if it is already i5 processor, it is basically no need to upgrade, if the performance is still not enough can consider changing the whole computer.
can
Most of the Lenovo z470cpu is okay, this series uses the 2 generation i series M end of the standard voltage processor, can support up to 2 generation notebook quad-core i7 processor, such as i7 2630QM and so on.