You can't really upgrade the CPU on such an older system at this point: Any such upgrades for that system's obsolete LGA 1156 socket will cost you more money than what performance improvement justifies. In addition, you cannot install an e5 series CPU at all on your system's current motherboard because the CPU and motherboard are completely incompatible with one another (the CPU will not even physically fit the motherboard's CPU socket at all).
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